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Influenza A virus

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859: 58: 1022: 1096:. Avian and pig influenza viruses can, on rare occasions, transmit to humans and cause zoonotic influenza virus infections; these infections are usually confined to people who have been in close contact with infected animals or material such as infected feces and meat, they do not spread to other humans. Symptoms of these infections in humans vary greatly; some are in asymptomatic or mild while others can cause severe disease, leading to severe pneumonia and death. A wide range of Influenza A virus subtypes have been found to cause zoonotic disease. 354: 79: 44: 1186: 888: 498: 269:" designates an IAV subtype that has a type-1 hemagglutinin (H) protein and a type-1 neuraminidase (N) protein. Almost all possible combinations of H (1 thru 16) and N (1 thru 11) have been isolated from wild birds. Further variations exist within the subtypes and can lead to very significant differences in the virus's ability to infect and cause disease, as well as to the severity of symptoms. 7206: 7194: 1325:
strain has evolved from an equine influenza avian virus which has adapted to sustained transmission among dogs. The H3N2 strain is derived from an avian influenza which jumped to dogs in 2004 in either Korea or China. It is likely that the virus persists in both animal shelters and kennels, as well as in farms where dogs are raised for meat production.
845:, takes place in the nucleus and involves two steps. The RdRp first of all transcribes the negative-sense viral genome into a positive-sense complimentary RNA (cRNA), then the cRNAs are used as templates to transcribe new negative-sense vRNA copies. These are exported from the nucleus and assemble near the cell membrane to form the core of new virions. 1394:
Stream 3. Minimizing the impact of pandemic, zoonotic, and seasonal epidemic influenza. This is principally concerned with vaccination - improving the effectiveness of vaccines, vaccine technology, as well as the speed with which an effective vaccine can be developed and ways in which vaccines can be
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Influenza research includes efforts to understand how influenza viruses enter hosts, the relationship between influenza viruses and bacteria, how influenza symptoms progress, and why some influenza viruses are deadlier than others. Past pandemics, and especially the 1918 pandemic, are the subject of
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As of June 2024, the influenza viruses which circulate widely in humans are IAV subtypes H1N1 and H2N3, together with Influenza B. Annual vaccination is the primary and most effective way to prevent influenza and influenza-associated complications, especially for high-risk groups. Vaccines against
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Stream 2. Limiting the spread of pandemic, zoonotic and seasonal epidemic influenza. This is more broadly targeted at both pandemic and seasonal influenza, looking at the transmission of the virus between people and the ways in which it can spread globally, as well as the environmental and social
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Most animals infected with canine influenza A will show symptoms such as coughing, runny nose, fever, lethargy, eye discharge, and a reduced appetite lasting anywhere from 2–3 weeks. There are two different influenza A dog flu viruses: one is an H3N8 virus and the other is an H3N2 virus. The H3N8
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Signs of swine flu in pigs can include fever, depression, coughing (barking), discharge from the nose or eyes, sneezing, breathing difficulties, eye redness or inflammation, and going off feed. Some pigs infected with influenza, however, may show no signs of illness at all. Swine flu subtypes are
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Because of the impact of avian influenza on economically important chicken farms, avian virus strains are classified as either highly pathogenic (and therefore potentially requiring vigorous control measures) or low pathogenic. The test for this is based solely on the effect on chickens - a virus
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of a large variety of influenza A viruses, which they can spread over large distances in their annual migration. Symptoms of avian influenza vary according to both the strain of virus underlying the infection, and on the species of bird affected. Symptoms of influenza in birds may include swollen
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The predominant natural reservoir of influenza viruses is thought to be wild waterfowl. The subtypes of influenza A virus are estimated to have diverged 2,000 years ago. Influenza viruses A and B are estimated to have diverged from a single ancestor around 4,000 years ago, while the ancestor of
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By definition, the subtyping scheme only takes into account the two outer proteins, not the at least 8 proteins internal to the virus. Almost all possible combinations of H (1 thru 16) and N (1 thru 11) have been isolated from wild birds. H17 and H18 have only been discovered in bats.
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in hosts who become infected with two different strains of influenza viruses at the same time. With reassortment between strains, an avian strain which does not affect humans may acquire characteristics from a different strain which enable it to infect and pass between humans - a
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of one to three days. Clinical signs of equine influenza include fever, nasal discharge, have a dry, hacking cough, depression, loss of appetite and weakness. EI is caused by two subtypes of influenza A viruses: H7N7 and H3N8, which have evolved from avian influenza A viruses.
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with the aim to inform development of both seasonal and pandemic vaccines. Several millions of specimens are tested by the GISRS network annually through a network of laboratories in 127 countries. As well as human viruses, GISRS monitors avian, swine, and other potentially
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with influenza control information and to inform vaccine development. Several millions of specimens are tested by the GISRS network annually through a network of laboratories in 127 countries. As well as human viruses, GISRS monitors avian, swine, and other potentially
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the flu are trivalent or quadrivalent, providing protection against the dominant strains of IAV(H1N1) and IAV(H3N2), and one or two influenza B virus strains; the formulation is continually reviewed in order to match the predominant strains in circulation.
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Stream 4. Optimizing the treatment of patients. This stream aims to reduce the impact of influenza by looking at methods of treatment, vulnerable groups, genetic predispositions, the interaction of influenza infection with other diseases, and influenza
296:, usually as a result of close contact with infected animals; symptoms range from mild to severe including death. Bird-adapted strains of the virus can be asymptomatic in some aquatic birds but lethal if they spread to other species, such as chickens. 525:
Core - The central core of the virion contains the viral RNA genome, which is made of eight separate segments. The nucleoprotein (NP) coats the viral RNA to form a ribonucleoprotein that assumes a helical (spiral) configuration. Three large proteins
1201:. The onset of symptoms is sudden, and initial symptoms are predominately non-specific: a sudden fever; muscle aches; cough; fatigue; sore throat; headache; difficulty sleeping; loss of appetite; diarrhoea or abdominal pain; nausea and vomiting. 1060:
Days are shorter during the winter, and lack of sunlight leads to low levels of vitamin D and melatonin, both of which require sunlight for their generation. This compromises our immune systems, which in turn decreases ability to fight the
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among humans since the 1900s originated from strains circulating in wild aquatic birds through reassortment with other influenza strains. It is possible (though not certain) that pigs may act as an intermediate host for reassortment.
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Influenza A virus continues to circulate and evolve in birds and pigs. Almost all possible combinations of H (1 thru 16) and N (1 thru 11) have been isolated from wild birds. As of June 2024, two particularly virulent IAV strains -
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Stream 5. Promoting the development and application of modern public health tools. Aiming to improve the ways in which public policy can combat influenza; this includes the introduction of new technologies, epidemic and pandemic
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principally H1N1, H1N2, and H3N2; it is spread either through close contact between animals or by the movement of contaminated equipment between farms. Humans who are in close contact with pigs can sometimes become infected.
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consists of a lipid bilayer derived from the host cell. Two viral proteins; hemagglutinin (HA) and neuraminidase (NA), are inserted into the envelope and are exposed as spikes on the surface of the virion. Both proteins are
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The table below presents a concise summary of the influenza genome and the principal functions of the proteins which are encoded. Segments are conventionally numbered from 1 to 8 in descending order of length.
553:; a host's immune system can react to them and produce antibodies in response. The M2 protein forms an ion channel in the envelope and is responsible for uncoating the virion once it has bound to a host cell. 1144:- it is possible to vaccinate poultry and pigs against specific strains of influenza. Vaccination should be combined with other control measures such as infection monitoring, early detection and biosecurity. 1042:. The season occurs during the cold half of the year in temperate regions; November through February in the northern hemisphere and May to October in the southern hemisphere. Flu seasons also exist in the 901:", which caused an estimated 20 to 50 million deaths worldwide. It is now known that this was caused by an immunologically novel H1N1 subtype of influenza A. The next pandemic took place in 1957, the " 1383:
Stream 1. Reducing the risk of emergence of pandemic influenza. This stream is entirely focused on preventing and limiting pandemic influenza; this includes research into what characteristics make a
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either mild or deadly, worldwide surveillance of influenza A viruses with pandemic potential, and the prevention and management of potentially zoonotic influenza in domestic and farmed animals.
923:) which was antigenically very different from previous H1N1 strains, leading to a pandemic in 2009. Because of its close resemblance to some strains circulating in pigs, this became known as " 4456: 1099:
Zoonotic infections can be prevented by good hygiene, by preventing farmed animals from coming into contact with wild animals, and by using appropriate personal protective equipment.
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in 142 BCE. The historian Fujikawa listed 46 epidemics of flu-like illness in Japan between 862 and 1868. In Europe and the Americas, a number of epidemics were recorded through the
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During the winter, people spend more time indoors with the windows sealed, so they are more likely to breathe the same air as someone who has the flu and thus contract the virus.
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in the viral envelope, which is activated once a virion has bound to a host cell. This uncoats the virus, exposing its infective contents to the cytoplasm of the host cell
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in humans. Mammals in which different strains of IAV circulate with sustained transmission are bats, pigs, horses and dogs; other mammals can occasionally become infected.
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for the transcription of positive-sense viral mRNA using the negative-sense viral RNA as a template. The host cell then transports the viral mRNA into the cytoplasm where
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At a later stage of infection, newly manufactured viral RNA segments assemble with the NP protein and polymerase (PB1, PB2 and PA) to form the core of a progeny virion
1050:, with variability from region to region. Annually, about 3 to 5 million cases of severe illness and 290,000 to 650,000 deaths from seasonal flu occur worldwide. 321: 3466: 2033: 914:) was caused by a H3N2 subtype in which the NA segment was derived from the 1957 virus, while the HA segment had been reassorted from an avian strain of influenza. 6769: 380:, there are 18 known types of hemagglutinin and 11 types of neuraminidase. Subtypes of IAV are classified by their combination of H and N proteins. For example, " 1257:) if 75% or more of chickens die after being deliberately infected with it, or if it is genetically similar to such a strain. The alternative classification is 396:
Due to the high variability of the virus, subtyping is not sufficient to uniquely identify a strain of influenza A virus. To unambiguously describe a specific
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the virus can evolve to acquire new characteristics, enabling it to evade host immunity and occasionally to jump from one species of host to another.
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The threat of pandemic influenza : are we ready? : workshop summary / prepared for Forum on Microbial Threats, Board on Global Health
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influenza viruses A and B and the ancestor of influenza virus C are estimated to have diverged from a common ancestor around 8,000 years ago.
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The main treatment for mild influenza is supportive; rest, fluids, and over-the-counter medicines to alleviate symptoms while the body's own
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Cooperates with the M1 protein to mediate the export of viral RNA copies from nucleus into cytoplasm in the late stage of viral replication
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Figure 1 shows a diagramatic representation of the genetic relatedness of Asian H5N1 hemagglutinin genes from various isolates of the virus
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Beigel JH, Farrar J, Han AM, Hayden FG, Hyer R, de Jong MD, et al. (September 2005). "Avian influenza A (H5N1) infection in humans".
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requires all detections of LPAI H5 and H7 subtypes to be reported because of their potential to mutate into highly pathogenic strains.
522:) is 80–120 nanometers in diameter such that the smallest virions adopt an elliptical shape; larger virions have a filamentous shape. 6320: 5833: 1305:
Equine influenza can affect horses, donkeys, and mules; it has a very high rate of transmission among horses, and a relatively short
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As of June 2024, there is concern about two subtypes of avian influenza which are circulating in wild bird populations worldwide,
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Part of the viral envelope, a protein that binds the virion to host cells, enabling the virus’s RNA genetic material to invade it
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Part of the viral envelope. NA enables the newly assembled virions to escape the host cell and go on to propagate the infection.
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This Memorandum was drafted by the signatories listed on page 590 on the occasion of a meeting held in Geneva in February 1980.
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An accessory protein of most IAVs. Not needed for virus replication and growth, it interferes with the host immune response.
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are recommended for those with severe symptoms, or for those who are at risk of developing complications such as pneumonia.
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NA also facilitates the movement of infective virus particles through mucus, enabling them to reach host epithelial cells.
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The Threat of Pandemic Influenza: Are We Ready? Workshop Summary. Institute of Medicine (US) Forum on Microbial Threats
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Highly pathogenic avian influenza virus is on every top ten list available for potential agricultural bioweapon agents
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Knobler SL, Mack A, Mahmoud A, Lemon SM, et al. (Institute of Medicine (US) Forum on Microbial Threats) (2005).
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and does not predict severity of symptoms in other species. Chickens infected with LPAI display mild symptoms or are
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Call SA, Vollenweider MA, Hornung CA, Simel DL, McKinney WP (February 2005). "Does this patient have influenza?".
3966:"Vaccination of poultry against highly pathogenic avian influenza – Available vaccines and vaccination strategies" 1453: 941:- are predominant in wild bird populations. These frequently cause outbreaks in domestic poultry, with occasional 5771: 5378: 5373: 5368: 3991: 3599: 1261:(LPAI). Classification of a virus strain as either LPAI or HPAI is based on the severity of symptoms in domestic 2414: 1110:. Both of these have potential to devastate poultry stocks, and both have jumped to humans with relatively high 534:, and PA), which are responsible for RNA transcription and replication, are bound to each segment of viral RNP. 78: 6374: 6360: 5557: 5455: 5398: 5363: 5358: 5353: 5348: 5343: 5338: 5333: 5328: 5323: 5318: 5313: 5308: 5303: 5298: 5293: 5288: 5283: 5278: 5273: 5268: 5263: 3741:"Recent Changes in Patterns of Mammal Infection with Highly Pathogenic Avian Influenza A(H5N1) Virus Worldwide" 1107: 1103: 938: 934: 381: 266: 4918: 4402: 1240:
head, watery eyes, unresponsiveness, lack of coordination, respiratory distress such as sneezing or gurgling.
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The influenza virus may survive better in colder, drier climates, and therefore be able to infect more people.
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Outbreaks of influenza-like disease can be found throughout recorded history. The first probable record is by
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Seasonal variation in deaths due to influenza or pneumonia in 122 U.S. cities, as a proportion of all causes.
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Taubenberger JK, Baltimore D, Doherty PC, Markel H, Morens DM, Webster RG, et al. (November 2012).
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which describes, among other things, the subtype, year, and place of collection. Some examples include:
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control measures are preferred. In humans, seasonal influenza can be treated in its early stages with
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Science in the News, a Graduate Student Group at the Harvard Graduate School of the Arts and Sciences
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Capsid - The matrix protein M1 forms a layer between the nucleoprotein and the envelope, called the
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which transports it into the host cell nucleus, where the viral RNA is transcribed and replicated.
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Hirve S, Newman LP, Paget J, Azziz-Baumgartner E, Fitzner J, Bhat N, et al. (27 April 2016).
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Krammer F, Smith GJ, Fouchier RA, Peiris M, Kedzierska K, Doherty PC, et al. (June 2018).
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The World Health Organization Global Influenza Program Surveillance Network (October 2005).
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Johnson J, Higgins A, Navarro A, Huang Y, Esper FL, Barton N, et al. (February 2012).
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Ciminski K, Ran W, Gorka M, Lee J, Malmlov A, Schinköthe J, et al. (December 2019).
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Subtypes of IAV are defined by the combination of the antigenic H and N proteins in the
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Department for Environment, Food & Rural Affairs and Animal and Plant Health Agency
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is an annually recurring time period characterized by the prevalence of an outbreak of
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In 1918-1919 came the first flu pandemic of the 20th century, known generally as the "
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Alexander DJ, Brown IH (April 2009). "History of highly pathogenic avian influenza".
4150: 3947: 3896: 3847: 3770: 3549: 3422: 3373: 3295: 3246: 3197: 3014: 2959: 2862: 2813: 2757: 2701: 2672:"The influenza A virus genome packaging network - complex, flexible and yet unsolved" 2647: 2531: 2475: 2384: 2290: 2215: 2131: 2082: 2013: 1907: 1671: 1622: 1542: 1534: 1524: 1421: 1306: 1132: 1039: 759: 5047:
Mahmoud (2005). Stacey L. Knobler, Alison Mack, Mahmoud A, Stanley M. Lemon (eds.).
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Counteracts the host’s natural immune response and inhibits interferon production.
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The nucleoprotein associates with the viral RNA to form a ribonucleoprotein (RNP).
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There are two methods of classification, one based on surface proteins (originally
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Influenza viruses have a relatively high mutation rate that is characteristic of
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This example carries an unusual designation in the last part: instead of a usual
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Dadonaite B, Vijayakrishnan S, Fodor E, Bhella D, Hutchinson EC (August 2016).
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Jakob C, Paul-Stansilaus R, Schwemmle M, Marquet R, Bolte H (September 2022).
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Tong S, Zhu X, Li Y, Shi M, Zhang J, Bourgeois M, et al. (October 2013).
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There are several possible reasons for the winter peak in temperate regions:
909: 817: 723: 695: 373: 115: 57: 4996: 3816:"Influenza virus-related critical illness: prevention, diagnosis, treatment" 1508: 704: 7123: 6973: 6651: 6512: 6123: 6002: 5898: 5521: 5197: 5033: 4891: 4834: 4765: 4716: 4578: 4457:"Equine Influenza: Respiratory Diseases of Horses: Merck Veterinary Manual" 4292: 4284: 4154: 4146: 3951: 3900: 3851: 3774: 3756: 3553: 3377: 3299: 3281: 3250: 3201: 2963: 2866: 2817: 2761: 2705: 2651: 2535: 2479: 2294: 2219: 2135: 1911: 1675: 1626: 1546: 1266: 966: 255: 4873: 4642: 3916:"Towards a universal influenza vaccine: different approaches for one goal" 3510:"Influenza Seasonality in the Tropics and Subtropics - When to Vaccinate?" 3426: 3215:
Kou Z, Lei FM, Yu J, Fan ZJ, Yin ZH, Jia CX, et al. (December 2005).
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Cold air reduces the ability of the nasal membranes to resist infection.
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See section 'Pneumonia and Influenza (P&I) Mortality Surveillance'
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event. It is thought that all influenza A viruses causing outbreaks or
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IAV disease in poultry can be can be prevented by vaccination, however
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The first bat flu virus, IAV(H17N10), was first discovered in 2009 in
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Webster RG, Bean WJ, Gorman OT, Chambers TM, Kawaoka Y (March 1992).
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Sanjuán R, Nebot MR, Chirico N, Mansky LM, Belshaw R (October 2010).
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Symptoms of influenza, with fever and cough the most common symptoms.
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The RdRp complex transcribes viral mRNAs by using a mechanism called
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that may be fatal. Humans can rarely become infected with strains of
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NEP (Nuclear Export Protein, formerly NS2 non-structural protein 2)
518:, enclosed in a lipid envelope. The virus particle (also called the 7239: 7156: 6803: 6545: 6401: 6090: 6050: 3739:
Plaza PI, Gamarra-Toledo V, EuguĂ­ JR, Lambertucci SA (March 2024).
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UK Government - Department for Environment Food & Rural Affairs
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Timeline of flu pandemics and epidemics caused by influenza A virus
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At the early stage of infection, the RNP binds to the host cell’s
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in the PA segment. Inhibits innate host immune responses, such as
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The Threat of Pandemic Influenza: Are We Ready?: Workshop Summary
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The Food and Agriculture Organization (FAO) of the United Nations
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Genetic evolution of human and swine influenza viruses, 1918–2009
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The Threat of Pandemic Influenza: Are We Ready? Workshop Summary
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Three viral proteins - PB1, PB2, and PA - associate to form the
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is a global network of laboratories that monitor the spread of
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Symptoms of human seasonal flu usually include fever, cough,
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Dou D, Revol R, Ă–stbye H, Wang H, Daniels R (20 July 2018).
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The replication of the influenza virus, unlike most other
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This example shows an additional field before the place:
4045:"Take everyday precautions to protect others while sick" 1589:
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In the 21st century, a strain of H1N1 flu (since titled
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4339:. Animal Plant Health Inspection Service. October 2013. 3093:
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much research to understand and prevent flu pandemics.
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The symptoms of seasonal flu are similar to those of a
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M1 also assists with the function of the NEP protein.
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H5N1 in particular has infected a 627:PB1-F2 (Polymerase Basic 1-Frame 2) 6471:Subacute sclerosing panencephalitis 5004:The New England Journal of Medicine 4997:Nature Reports: Homepage: Avian Flu 4485: 4446: 4305: 4167: 4042: 3787: 3703: 3674: 3645: 3560: 3445:European Centre for Disease Control 3315: 2425:from the original on 10 August 2023 1976: 1765: 1739: 1688: 1682: 814:Viral messenger RNA Transcription - 442:indicates the subtype of the virus. 424:indicates the place of collection. 24: 5940:2017–2018 United States flu season 5114:Sobrino F, Mettenleiter T (2008). 5097:Influenza Virology: Current Topics 4940: 4505: 4114:from the original on 1 August 2020 4104:"Flu Symptoms & Complications" 3617: 3233:10.1128/JVI.79.24.15460-15466.2005 3051: 2970: 2894:10.1016/B978-0-12-811257-1.00003-6 2573: 2542: 2502:"The biology of influenza viruses" 2301: 1840: 1456:from the original on 20 March 2020 1391:factors which affect transmission. 409:A/Rio de Janeiro/62434/2021 (H3N2) 68:micrograph of influenza A viruses 25: 7371: 6790:Severe acute respiratory syndrome 6316:Follicular dendritic cell sarcoma 5679:Live attenuated influenza vaccine 5116:Animal Viruses: Molecular Biology 4794:from the original on 10 June 2024 2831:Decroly E, Canard B (June 2017). 1733: 1553: 1507:Runstadler JA, Puryear W (2020). 1468: 1251:highly pathogenic avian influenza 1244:Highly pathogenic avian influenza 1162:works to recover from infection. 1080:a disease in a human caused by a 618:It also degrades the host cell’s 463:A/California/04/2009 A(H1N1)pdm09 428:is a laboratory sequence number. 357:Diagram of influenza nomenclature 332: 307:medicines. 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Archived from 4453: 4444: 4443: 4441: 4439: 4425: 4419: 4418: 4416: 4414: 4399: 4393: 4392: 4390: 4388: 4383:. 3 October 2018 4373: 4367: 4366: 4364: 4362: 4347: 4341: 4340: 4329: 4323: 4322: 4320: 4318: 4303: 4297: 4296: 4268: 4262: 4261: 4259: 4257: 4243: 4237: 4236: 4234: 4232: 4217: 4211: 4210: 4208: 4206: 4191: 4185: 4184: 4182: 4180: 4165: 4159: 4158: 4130: 4124: 4123: 4121: 4119: 4100: 4094: 4093: 4091: 4089: 4080:. 10 July 2019. 4066: 4060: 4059: 4057: 4055: 4040: 4034: 4033: 4031: 4029: 4014: 4008: 4007: 4005: 4003: 3988: 3982: 3981: 3979: 3977: 3962: 3956: 3955: 3945: 3935: 3920:Virology Journal 3911: 3905: 3904: 3894: 3862: 3856: 3855: 3845: 3835: 3811: 3805: 3804: 3802: 3800: 3785: 3779: 3778: 3768: 3736: 3730: 3729: 3727: 3725: 3710: 3701: 3700: 3698: 3696: 3681: 3672: 3671: 3669: 3667: 3652: 3643: 3642: 3640: 3638: 3621: 3615: 3614: 3612: 3610: 3595: 3589: 3588: 3586: 3584: 3569: 3558: 3557: 3547: 3537: 3505: 3499: 3489: 3483: 3482: 3480: 3478: 3463: 3457: 3456: 3454: 3452: 3437: 3431: 3430: 3420: 3388: 3382: 3381: 3371: 3339: 3333: 3332: 3330: 3328: 3313: 3307: 3303: 3293: 3261: 3255: 3254: 3244: 3212: 3206: 3205: 3195: 3163: 3157: 3156: 3154: 3152: 3147:. 3 October 2023 3137: 3131: 3130: 3128: 3126: 3111: 3105: 3104: 3102: 3100: 3085: 3079: 3078: 3076: 3074: 3058: 3049: 3048: 3046: 3044: 3029: 3023: 3022: 3002: 2996: 2995: 2993: 2991: 2977: 2968: 2967: 2957: 2933: 2927: 2926: 2914: 2908: 2907: 2905: 2877: 2871: 2870: 2860: 2828: 2822: 2821: 2811: 2801: 2777: 2766: 2765: 2755: 2745: 2721: 2710: 2709: 2699: 2667: 2656: 2655: 2645: 2613: 2602: 2601: 2599: 2597: 2582: 2571: 2570: 2568: 2566: 2551: 2540: 2539: 2529: 2497: 2484: 2483: 2473: 2456:(8): 1755–1764. 2441: 2435: 2434: 2432: 2430: 2411: 2396: 2395: 2382: 2359: 2353: 2352: 2350: 2348: 2333: 2327: 2326: 2324: 2322: 2308: 2299: 2298: 2288: 2256: 2250: 2249: 2247: 2245: 2230: 2224: 2223: 2213: 2203: 2194:(10): e1003657. 2179: 2173: 2172: 2170: 2168: 2159:. 2 April 2013. 2149: 2140: 2139: 2129: 2097: 2091: 2090: 2080: 2056: 2050: 2049: 2047: 2045: 2030: 2024: 2023: 2003: 1994: 1993: 1991: 1989: 1974: 1968: 1967: 1965: 1963: 1948: 1942: 1941: 1939: 1937: 1922: 1916: 1915: 1905: 1873: 1867: 1866: 1864: 1862: 1847: 1838: 1837: 1835: 1833: 1818: 1809: 1808: 1806: 1804: 1789: 1783: 1782: 1780: 1778: 1763: 1757: 1756: 1754: 1752: 1737: 1731: 1730: 1728: 1726: 1712: 1706: 1705: 1703: 1701: 1686: 1680: 1679: 1669: 1637: 1631: 1630: 1620: 1610: 1586: 1580: 1579: 1577: 1575: 1560: 1551: 1550: 1504: 1498: 1497: 1495: 1493: 1479: 1466: 1465: 1463: 1461: 1442: 1320:Canine influenza 1301:Equine influenza 1272:Since 2006, the 565: 564: 475: 471: 464: 456: 449: 441: 435: 431: 427: 423: 417: 410: 265:; for example, " 218:Orthomyxoviridae 165:Orthomyxoviridae 82: 81: 60: 46: 32: 31: 27:Species of virus 21: 18:Influenzavirus A 7375: 7374: 7370: 7369: 7368: 7366: 7365: 7364: 7355:Animal virology 7340: 7339: 7338: 7333: 7325: 7320: 7312: 7307: 7299: 7294: 7286: 7281: 7273: 7268: 7259: 7258: 7253: 7244: 7243: 7238: 7225: 7215: 7203: 7193: 7191: 7183: 7181: 7176: 7138: 7118: 7026: 7000:Gastroenteritis 6958: 6955:Gastroenteritis 6949: 6937:Cytomegalovirus 6900: 6889: 6857:Paramyxoviridae 6846:Avian influenza 6722: 6717:Cytomegalovirus 6681:viral pneumonia 6679: 6676:nasopharyngitis 6675: 6672: 6663: 6627: 6601:Cytomegalovirus 6586: 6540: 6428: 6415: 6408: 6381: 6248:Cervical cancer 6208: 6199: 6169: 6164: 6160:Antiviral drugs 6148: 6095: 6022: 5989: 5984: 5954: 5949: 5923: 5866: 5845: 5796: 5766: 5711: 5709: 5698: 5665: 5649: 5596:Antiviral drugs 5577: 5548: 5534:Human mortality 5527:clinical trials 5495: 5446: 5430: 5393: 5257: 5255: 5248: 5212: 5166: 5161: 5126: 5107: 5083: 5059: 5017:10.1.1.730.7890 4983: 4954: 4943: 4941:Further reading 4938: 4928: 4926: 4917: 4916: 4899: 4854: 4850: 4811: 4807: 4797: 4795: 4786: 4785: 4781: 4728: 4724: 4691:(4): e1008384. 4677: 4673: 4663: 4661: 4659:10.1038/503169e 4641: 4640: 4636: 4626: 4624: 4616: 4615: 4611: 4601: 4599: 4591: 4590: 4586: 4541: 4537: 4527: 4525: 4516: 4515: 4506: 4496: 4494: 4484: 4480: 4470: 4468: 4455: 4454: 4447: 4437: 4435: 4427: 4426: 4422: 4412: 4410: 4409:. 30 March 2024 4401: 4400: 4396: 4386: 4384: 4375: 4374: 4370: 4360: 4358: 4349: 4348: 4344: 4331: 4330: 4326: 4316: 4314: 4304: 4300: 4269: 4265: 4255: 4253: 4245: 4244: 4240: 4230: 4228: 4219: 4218: 4214: 4204: 4202: 4201:. 9 August 2023 4193: 4192: 4188: 4178: 4176: 4166: 4162: 4131: 4127: 4117: 4115: 4102: 4101: 4097: 4087: 4085: 4068: 4067: 4063: 4053: 4051: 4041: 4037: 4027: 4025: 4016: 4015: 4011: 4001: 3999: 3990: 3989: 3985: 3975: 3973: 3964: 3963: 3959: 3912: 3908: 3877:(10): 828–832. 3863: 3859: 3812: 3808: 3798: 3796: 3786: 3782: 3737: 3733: 3723: 3721: 3712: 3711: 3704: 3694: 3692: 3683: 3682: 3675: 3665: 3663: 3654: 3653: 3646: 3636: 3634: 3623: 3622: 3618: 3608: 3606: 3596: 3592: 3582: 3580: 3571: 3570: 3561: 3520:(4): e0153003. 3506: 3502: 3490: 3486: 3476: 3474: 3465: 3464: 3460: 3450: 3448: 3439: 3438: 3434: 3389: 3385: 3340: 3336: 3326: 3324: 3314: 3310: 3262: 3258: 3213: 3209: 3164: 3160: 3150: 3148: 3139: 3138: 3134: 3124: 3122: 3121:. 26 March 2021 3113: 3112: 3108: 3098: 3096: 3087: 3086: 3082: 3072: 3070: 3059: 3052: 3042: 3040: 3039:. 20 March 2019 3031: 3030: 3026: 3003: 2999: 2989: 2987: 2979: 2978: 2971: 2934: 2930: 2915: 2911: 2878: 2874: 2829: 2825: 2778: 2769: 2722: 2713: 2668: 2659: 2614: 2605: 2595: 2593: 2584: 2583: 2574: 2564: 2562: 2552: 2543: 2498: 2487: 2442: 2438: 2428: 2426: 2413: 2412: 2399: 2361: 2360: 2356: 2346: 2344: 2335: 2334: 2330: 2320: 2318: 2310: 2309: 2302: 2257: 2253: 2243: 2241: 2232: 2231: 2227: 2180: 2176: 2166: 2164: 2151: 2150: 2143: 2098: 2094: 2057: 2053: 2043: 2041: 2032: 2031: 2027: 2020: 2004: 1997: 1987: 1985: 1975: 1971: 1961: 1959: 1950: 1949: 1945: 1935: 1933: 1924: 1923: 1919: 1874: 1870: 1860: 1858: 1849: 1848: 1841: 1831: 1829: 1820: 1819: 1812: 1802: 1800: 1791: 1790: 1786: 1776: 1774: 1764: 1760: 1750: 1748: 1738: 1734: 1724: 1722: 1714: 1713: 1709: 1699: 1697: 1687: 1683: 1638: 1634: 1587: 1583: 1573: 1571: 1562: 1561: 1554: 1531: 1505: 1501: 1491: 1489: 1481: 1480: 1469: 1459: 1457: 1444: 1443: 1439: 1435: 1418: 1369: 1345:Sturnira lilium 1337: 1331: 1322: 1316: 1307:incubation time 1303: 1297: 1288: 1286:Swine influenza 1282: 1246: 1235:act as natural 1229: 1227:Avian influenza 1223: 1218: 1210:swine influenza 1183: 1178: 1172: 1164:Antiviral drugs 1156: 1150: 1135: 1129: 1124: 1074: 1019: 1013: 985: 951: 870: 856: 851: 810:the viral RNA. 559: 544:Envelope - The 533: 529: 508: 495: 489: 473: 469: 462: 454: 447: 439: 433: 429: 425: 421: 415: 408: 394: 351: 335: 330: 294:swine influenza 193: 153:Articulavirales 141:Insthoviricetes 129:Negarnaviricota 76: 28: 23: 22: 15: 12: 11: 5: 7373: 7363: 7362: 7357: 7352: 7335: 7334: 7332: 7331: 7318: 7305: 7292: 7279: 7266: 7251: 7235: 7233: 7227: 7226: 7214: 7213: 7201: 7178: 7177: 7175: 7174: 7173: 7172: 7160: 7152: 7150: 7144: 7143: 7140: 7139: 7137: 7136: 7128: 7126: 7120: 7119: 7117: 7116: 7104: 7092: 7080: 7068: 7061: 7055: 7054: 7042: 7036: 7034: 7028: 7027: 7025: 7024: 7017: 7010: 7003: 6991: 6985: 6984: 6983: 6982: 6970: 6964: 6962: 6951: 6950: 6948: 6947: 6946: 6945: 6933: 6932: 6931: 6918: 6916: 6903: 6895: 6894: 6891: 6890: 6888: 6887: 6880: 6873: 6872: 6871: 6851: 6850: 6849: 6848: 6809: 6808: 6807: 6806: 6794: 6793: 6792: 6780: 6779: 6778: 6766: 6765: 6764: 6732: 6730: 6724: 6723: 6721: 6720: 6713: 6712: 6711: 6694: 6692: 6683: 6665: 6664: 6662: 6661: 6660: 6659: 6654: 6641: 6639: 6637:Cardiovascular 6633: 6632: 6629: 6628: 6626: 6625: 6624: 6623: 6611: 6610: 6609: 6596: 6594: 6588: 6587: 6585: 6584: 6583: 6582: 6570: 6569: 6568: 6563: 6550: 6548: 6542: 6541: 6539: 6538: 6533: 6528: 6523: 6522: 6521: 6509: 6508: 6507: 6494: 6489: 6488: 6487: 6475: 6474: 6473: 6461: 6455: 6454: 6453: 6452: 6440: 6434: 6432: 6418: 6416:nervous system 6410: 6409: 6407: 6406: 6405: 6404: 6391: 6389: 6383: 6382: 6380: 6379: 6378: 6377: 6365: 6364: 6363: 6358: 6346: 6340: 6339: 6338: 6337: 6325: 6324: 6323: 6318: 6313: 6308: 6303: 6291: 6290: 6289: 6277: 6276: 6275: 6270: 6268:Vaginal cancer 6265: 6260: 6255: 6250: 6238: 6237: 6236: 6224: 6218: 6216: 6210: 6209: 6198: 6197: 6190: 6183: 6175: 6166: 6165: 6163: 6162: 6156: 6154: 6150: 6149: 6147: 6146: 6141: 6136: 6131: 6126: 6121: 6116: 6111: 6105: 6103: 6097: 6096: 6094: 6093: 6088: 6083: 6078: 6073: 6068: 6063: 6058: 6053: 6048: 6043: 6038: 6032: 6030: 6024: 6023: 6021: 6020: 6015: 6010: 6005: 5999: 5997: 5991: 5990: 5983: 5982: 5975: 5968: 5960: 5951: 5950: 5948: 5947: 5942: 5937: 5931: 5929: 5928:Related topics 5925: 5924: 5922: 5921: 5916: 5911: 5906: 5901: 5896: 5891: 5886: 5880: 5878: 5872: 5871: 5868: 5867: 5865: 5864: 5859: 5853: 5851: 5847: 5846: 5844: 5843: 5838: 5837: 5836: 5826: 5821: 5815: 5813: 5806: 5802: 5801: 5798: 5797: 5795: 5794: 5789: 5788: 5787: 5776: 5774: 5768: 5767: 5765: 5764: 5759: 5754: 5749: 5744: 5739: 5734: 5729: 5723: 5721: 5712: 5707: 5704: 5703: 5700: 5699: 5697: 5696: 5691: 5686: 5681: 5675: 5673: 5667: 5666: 5664: 5663: 5658: 5653: 5650:(experimental) 5645: 5644: 5643: 5638: 5633: 5628: 5618: 5617: 5616: 5611: 5600: 5598: 5589: 5583: 5582: 5579: 5578: 5576: 5575: 5569: 5567: 5560: 5554: 5553: 5550: 5549: 5547: 5546: 5541: 5536: 5531: 5530: 5529: 5519: 5514: 5509: 5503: 5501: 5497: 5496: 5494: 5493: 5491:2020s outbreak 5488: 5483: 5478: 5473: 5471:Croatia (2005) 5467: 5465: 5458: 5452: 5451: 5448: 5447: 5445: 5444: 5438: 5436: 5432: 5431: 5429: 5428: 5423: 5418: 5412: 5410: 5401: 5395: 5394: 5392: 5391: 5386: 5381: 5376: 5371: 5366: 5361: 5356: 5351: 5346: 5341: 5336: 5331: 5326: 5321: 5316: 5311: 5306: 5301: 5296: 5291: 5286: 5281: 5276: 5271: 5266: 5260: 5258: 5253: 5250: 5249: 5247: 5246: 5241: 5236: 5231: 5226: 5220: 5218: 5214: 5213: 5211: 5210: 5205: 5203:Superinfection 5200: 5195: 5190: 5185: 5180: 5174: 5172: 5171:General topics 5168: 5167: 5160: 5159: 5152: 5145: 5137: 5131: 5130: 5124: 5111: 5105: 5092: 5087: 5081: 5066: 5057: 5044: 5038: 4999: 4994: 4977: 4976: 4972: 4971: 4965: 4948: 4947: 4942: 4939: 4937: 4936: 4925:. Geneva. 2017 4897: 4848: 4821:(4): 572–579. 4805: 4779: 4722: 4685:PLOS Pathogens 4671: 4634: 4609: 4584: 4555:(1): a038562. 4535: 4504: 4478: 4445: 4420: 4394: 4368: 4357:. 15 June 2017 4342: 4324: 4298: 4263: 4238: 4212: 4186: 4160: 4141:(8): 987–997. 4125: 4095: 4061: 4035: 4009: 3983: 3970:efsa.europa.eu 3957: 3906: 3857: 3806: 3780: 3751:(3): 444–452. 3731: 3720:. 29 July 2020 3702: 3673: 3662:. 29 July 2020 3644: 3616: 3590: 3559: 3500: 3484: 3458: 3447:. 15 June 2017 3432: 3403:(1): 152–179. 3383: 3334: 3308: 3256: 3207: 3158: 3132: 3106: 3095:. 11 June 2019 3080: 3050: 3024: 2997: 2969: 2928: 2909: 2872: 2823: 2767: 2711: 2657: 2603: 2572: 2541: 2485: 2436: 2397: 2354: 2343:. 17 June 2024 2328: 2300: 2251: 2225: 2188:PLOS Pathogens 2174: 2141: 2112:(2): 396–400. 2092: 2071:(3): 461–468. 2051: 2025: 2018: 1995: 1969: 1943: 1932:. 12 June 2024 1917: 1868: 1839: 1810: 1784: 1758: 1732: 1707: 1681: 1632: 1581: 1552: 1529: 1499: 1467: 1436: 1434: 1431: 1430: 1429: 1424: 1417: 1414: 1413: 1412: 1404: 1396: 1392: 1388: 1368: 1365: 1333:Main article: 1330: 1327: 1318:Main article: 1315: 1312: 1299:Main article: 1296: 1293: 1284:Main article: 1281: 1278: 1245: 1242: 1225:Main article: 1222: 1219: 1217: 1214: 1182: 1179: 1174:Main article: 1171: 1168: 1152:Main article: 1149: 1146: 1131:Main article: 1128: 1125: 1123: 1120: 1073: 1070: 1069: 1068: 1065: 1062: 1058: 1015:Main article: 1012: 1009: 984: 981: 950: 947: 855: 852: 850: 847: 794: 793: 790: 786: 785: 782: 777: 774: 770: 769: 766:proton channel 762: 756: 755: 745: 740: 737: 733: 732: 726: 721: 718: 714: 713: 698: 693: 690: 686: 685: 682: 677: 674: 670: 669: 656:Arises from a 654: 651: 649: 646: 645: 642: 639: 636: 632: 631: 628: 624: 623: 614: 611: 608: 604: 603: 589: 586: 583: 579: 578: 575: 572: 569: 558: 555: 546:viral envelope 531: 527: 512:negative-sense 507: 504: 488: 485: 484: 483: 482: 481: 460: 459: 458: 445: 444: 443: 437: 422:Rio de Janeiro 419: 393: 390: 361:There are two 350: 347: 334: 333:Classification 331: 329: 326: 282:conjunctivitis 263:viral envelope 245:negative-sense 195: 194: 187: 185: 181: 180: 173: 169: 168: 161: 157: 156: 149: 145: 144: 137: 133: 132: 125: 121: 120: 113: 109: 108: 101: 94: 93: 88: 84: 83: 70: 69: 62: 61: 53: 52: 48: 47: 39: 38: 26: 9: 6: 4: 3: 2: 7372: 7361: 7358: 7356: 7353: 7351: 7348: 7347: 7345: 7328: 7323: 7319: 7315: 7310: 7306: 7302: 7297: 7293: 7289: 7284: 7280: 7276: 7271: 7267: 7262: 7256: 7252: 7247: 7241: 7237: 7236: 7234: 7232: 7228: 7224: 7219: 7212: 7207: 7202: 7200: 7190: 7189: 7186: 7171: 7168: 7167: 7166: 7165: 7161: 7159: 7158: 7154: 7153: 7151: 7149: 7145: 7135: 7134: 7130: 7129: 7127: 7125: 7121: 7114: 7110: 7109: 7105: 7102: 7098: 7097: 7093: 7090: 7086: 7085: 7081: 7078: 7074: 7073: 7069: 7067: 7066: 7062: 7060: 7057: 7056: 7052: 7048: 7047: 7043: 7041: 7038: 7037: 7035: 7033: 7029: 7023: 7022: 7018: 7016: 7015: 7011: 7009: 7008: 7004: 7001: 6997: 6996: 6992: 6990: 6987: 6986: 6981: 6978: 6977: 6976: 6975: 6971: 6969: 6966: 6965: 6963: 6961: 6956: 6952: 6944: 6941: 6940: 6939: 6938: 6934: 6930: 6927: 6926: 6925: 6924: 6920: 6919: 6917: 6915: 6911: 6907: 6904: 6902: 6896: 6886: 6885: 6881: 6879: 6878: 6874: 6870: 6869:Parainfluenza 6867: 6866: 6865: 6864: 6859: 6858: 6853: 6852: 6847: 6843: 6840: 6839: 6838: 6837: 6833: 6829: 6825: 6820: 6819: 6814: 6811: 6810: 6805: 6802: 6801: 6800: 6799: 6795: 6791: 6788: 6787: 6786: 6785: 6781: 6777: 6774: 6773: 6772: 6771: 6767: 6763: 6760: 6759: 6758: 6757: 6753: 6749: 6745: 6742: 6737: 6734: 6733: 6731: 6729: 6725: 6719: 6718: 6714: 6710: 6706: 6705:EBV infection 6703: 6702: 6701: 6700: 6696: 6695: 6693: 6691: 6687: 6684: 6682: 6677: 6670: 6666: 6658: 6655: 6653: 6650: 6649: 6648: 6647: 6643: 6642: 6640: 6638: 6634: 6622: 6619: 6618: 6617: 6616: 6612: 6608: 6605: 6604: 6603: 6602: 6598: 6597: 6595: 6593: 6589: 6581: 6578: 6577: 6576: 6575: 6571: 6567: 6564: 6562: 6561:Poliomyelitis 6559: 6558: 6557: 6556: 6552: 6551: 6549: 6547: 6543: 6537: 6534: 6532: 6529: 6527: 6524: 6520: 6517: 6516: 6515: 6514: 6510: 6506: 6503: 6502: 6500: 6499: 6495: 6493: 6490: 6486: 6483: 6482: 6481: 6480: 6476: 6472: 6469: 6468: 6467: 6466: 6462: 6460: 6457: 6456: 6451: 6448: 6447: 6446: 6445: 6441: 6439: 6436: 6435: 6433: 6431: 6426: 6422: 6419: 6417: 6411: 6403: 6400: 6399: 6398: 6397: 6393: 6392: 6390: 6388: 6384: 6376: 6373: 6372: 6371: 6370: 6366: 6362: 6359: 6357: 6354: 6353: 6352: 6351: 6347: 6345: 6342: 6341: 6336: 6333: 6332: 6331: 6330: 6326: 6322: 6319: 6317: 6314: 6312: 6309: 6307: 6304: 6302: 6299: 6298: 6297: 6296: 6292: 6288: 6285: 6284: 6283: 6282: 6278: 6274: 6271: 6269: 6266: 6264: 6263:Vulvar cancer 6261: 6259: 6258:Penile cancer 6256: 6254: 6251: 6249: 6246: 6245: 6244: 6243: 6239: 6235: 6232: 6231: 6230: 6229: 6225: 6223: 6220: 6219: 6217: 6215: 6211: 6207: 6203: 6196: 6191: 6189: 6184: 6182: 6177: 6176: 6173: 6161: 6158: 6157: 6155: 6151: 6145: 6142: 6140: 6137: 6135: 6132: 6130: 6127: 6125: 6122: 6120: 6117: 6115: 6114:Bronchiolitis 6112: 6110: 6107: 6106: 6104: 6102: 6101:Complications 6098: 6092: 6089: 6087: 6084: 6082: 6079: 6077: 6074: 6072: 6069: 6067: 6064: 6062: 6059: 6057: 6054: 6052: 6049: 6047: 6044: 6042: 6039: 6037: 6034: 6033: 6031: 6029: 6025: 6019: 6016: 6014: 6011: 6009: 6006: 6004: 6001: 6000: 5998: 5996: 5992: 5988: 5981: 5976: 5974: 5969: 5967: 5962: 5961: 5958: 5946: 5943: 5941: 5938: 5936: 5933: 5932: 5930: 5926: 5920: 5917: 5915: 5912: 5910: 5907: 5905: 5902: 5900: 5897: 5895: 5892: 5890: 5889:Bronchiolitis 5887: 5885: 5882: 5881: 5879: 5877: 5876:Complications 5873: 5863: 5862:Fujian (H5N1) 5860: 5858: 5855: 5854: 5852: 5848: 5842: 5839: 5835: 5832: 5831: 5830: 5827: 5825: 5822: 5820: 5817: 5816: 5814: 5810: 5807: 5803: 5793: 5790: 5786: 5783: 5782: 5781: 5778: 5777: 5775: 5773: 5769: 5763: 5760: 5758: 5755: 5753: 5750: 5748: 5745: 5743: 5740: 5738: 5735: 5733: 5730: 5728: 5725: 5724: 5722: 5720: 5716: 5713: 5708:Pandemics and 5705: 5695: 5692: 5690: 5687: 5685: 5682: 5680: 5677: 5676: 5674: 5672: 5668: 5662: 5659: 5657: 5654: 5652: 5646: 5642: 5639: 5637: 5634: 5632: 5629: 5627: 5624: 5623: 5622: 5619: 5615: 5612: 5610: 5607: 5606: 5605: 5602: 5601: 5599: 5597: 5593: 5590: 5588: 5584: 5574: 5571: 5570: 5568: 5564: 5561: 5559: 5555: 5545: 5542: 5540: 5539:Social impact 5537: 5535: 5532: 5528: 5525: 5524: 5523: 5520: 5518: 5517:Global spread 5515: 5513: 5510: 5508: 5505: 5504: 5502: 5498: 5492: 5489: 5487: 5484: 5482: 5479: 5477: 5474: 5472: 5469: 5468: 5466: 5462: 5459: 5457: 5453: 5443: 5440: 5439: 5437: 5433: 5427: 5424: 5422: 5419: 5417: 5414: 5413: 5411: 5409: 5405: 5402: 5400: 5396: 5390: 5387: 5385: 5382: 5380: 5377: 5375: 5372: 5370: 5367: 5365: 5362: 5360: 5357: 5355: 5352: 5350: 5347: 5345: 5342: 5340: 5337: 5335: 5332: 5330: 5327: 5325: 5322: 5320: 5317: 5315: 5312: 5310: 5307: 5305: 5302: 5300: 5297: 5295: 5292: 5290: 5287: 5285: 5282: 5280: 5277: 5275: 5272: 5270: 5267: 5265: 5262: 5261: 5259: 5251: 5245: 5242: 5240: 5237: 5235: 5232: 5230: 5227: 5225: 5222: 5221: 5219: 5215: 5209: 5206: 5204: 5201: 5199: 5196: 5194: 5191: 5189: 5186: 5184: 5181: 5179: 5176: 5175: 5173: 5169: 5165: 5158: 5153: 5151: 5146: 5144: 5139: 5138: 5135: 5127: 5121: 5117: 5112: 5108: 5102: 5098: 5093: 5091: 5088: 5084: 5078: 5074: 5073: 5067: 5064: 5060: 5058:0-309-09504-2 5054: 5050: 5045: 5042: 5039: 5035: 5031: 5027: 5023: 5018: 5013: 5009: 5005: 5000: 4998: 4995: 4993: 4992: 4988: 4985: 4984: 4982: 4974: 4973: 4969: 4966: 4963: 4959: 4956: 4955: 4953: 4945: 4944: 4924: 4920: 4914: 4912: 4910: 4908: 4906: 4904: 4902: 4893: 4889: 4884: 4879: 4875: 4871: 4867: 4863: 4859: 4852: 4844: 4840: 4836: 4832: 4828: 4824: 4820: 4816: 4809: 4793: 4789: 4783: 4775: 4771: 4767: 4763: 4758: 4753: 4749: 4745: 4741: 4737: 4733: 4726: 4718: 4714: 4709: 4704: 4699: 4694: 4690: 4686: 4682: 4675: 4660: 4656: 4652: 4648: 4644: 4638: 4623: 4619: 4613: 4598: 4594: 4588: 4580: 4576: 4571: 4566: 4562: 4558: 4554: 4550: 4546: 4539: 4523: 4519: 4513: 4511: 4509: 4493: 4489: 4482: 4466: 4462: 4458: 4452: 4450: 4434: 4430: 4424: 4408: 4404: 4398: 4382: 4378: 4372: 4356: 4352: 4346: 4338: 4334: 4328: 4313: 4309: 4302: 4294: 4290: 4286: 4282: 4278: 4274: 4267: 4252: 4248: 4242: 4226: 4222: 4216: 4200: 4196: 4190: 4175: 4171: 4164: 4156: 4152: 4148: 4144: 4140: 4136: 4129: 4113: 4109: 4105: 4099: 4083: 4079: 4077: 4071: 4065: 4050: 4046: 4039: 4023: 4019: 4013: 3998:. 3 June 2024 3997: 3993: 3987: 3971: 3967: 3961: 3953: 3949: 3944: 3939: 3934: 3929: 3925: 3921: 3917: 3910: 3902: 3898: 3893: 3888: 3884: 3880: 3876: 3872: 3868: 3861: 3853: 3849: 3844: 3839: 3834: 3829: 3825: 3821: 3820:Critical Care 3817: 3810: 3795: 3791: 3784: 3776: 3772: 3767: 3762: 3758: 3754: 3750: 3746: 3742: 3735: 3719: 3715: 3709: 3707: 3691:. 23 May 2023 3690: 3686: 3680: 3678: 3661: 3657: 3651: 3649: 3632: 3631: 3626: 3620: 3605: 3601: 3594: 3578: 3574: 3568: 3566: 3564: 3555: 3551: 3546: 3541: 3536: 3531: 3527: 3523: 3519: 3515: 3511: 3504: 3497: 3493: 3488: 3472: 3468: 3462: 3446: 3442: 3436: 3428: 3424: 3419: 3414: 3410: 3406: 3402: 3398: 3394: 3387: 3379: 3375: 3370: 3365: 3361: 3357: 3353: 3349: 3345: 3338: 3323: 3319: 3312: 3306: 3301: 3297: 3292: 3287: 3283: 3279: 3275: 3271: 3267: 3260: 3252: 3248: 3243: 3238: 3234: 3230: 3226: 3222: 3218: 3211: 3203: 3199: 3194: 3189: 3185: 3181: 3177: 3173: 3169: 3162: 3146: 3142: 3136: 3120: 3116: 3110: 3094: 3090: 3084: 3068: 3064: 3057: 3055: 3038: 3034: 3028: 3020: 3016: 3012: 3008: 3001: 2986: 2982: 2976: 2974: 2965: 2961: 2956: 2951: 2947: 2943: 2939: 2932: 2924: 2920: 2913: 2904: 2899: 2895: 2891: 2887: 2883: 2876: 2868: 2864: 2859: 2854: 2850: 2846: 2842: 2838: 2834: 2827: 2819: 2815: 2810: 2805: 2800: 2795: 2791: 2787: 2783: 2776: 2774: 2772: 2763: 2759: 2754: 2749: 2744: 2739: 2735: 2731: 2727: 2720: 2718: 2716: 2707: 2703: 2698: 2693: 2689: 2685: 2681: 2677: 2673: 2666: 2664: 2662: 2653: 2649: 2644: 2639: 2635: 2631: 2627: 2623: 2619: 2612: 2610: 2608: 2592:. 13 May 2010 2591: 2587: 2581: 2579: 2577: 2561: 2557: 2550: 2548: 2546: 2537: 2533: 2528: 2523: 2519: 2515: 2511: 2507: 2503: 2496: 2494: 2492: 2490: 2481: 2477: 2472: 2467: 2463: 2459: 2455: 2451: 2447: 2440: 2424: 2420: 2416: 2410: 2408: 2406: 2404: 2402: 2394: 2390: 2386: 2381: 2376: 2372: 2368: 2364: 2358: 2342: 2338: 2332: 2317: 2313: 2307: 2305: 2296: 2292: 2287: 2282: 2278: 2274: 2270: 2266: 2262: 2255: 2239: 2235: 2229: 2221: 2217: 2212: 2207: 2202: 2197: 2193: 2189: 2185: 2178: 2162: 2158: 2154: 2148: 2146: 2137: 2133: 2128: 2123: 2119: 2115: 2111: 2107: 2103: 2096: 2088: 2084: 2079: 2074: 2070: 2066: 2062: 2055: 2039: 2035: 2029: 2021: 2019:9780810878587 2015: 2011: 2010: 2002: 2000: 1984: 1980: 1973: 1958:. 5 June 2023 1957: 1953: 1947: 1931: 1927: 1921: 1913: 1909: 1904: 1899: 1895: 1891: 1887: 1883: 1879: 1872: 1856: 1852: 1846: 1844: 1827: 1823: 1817: 1815: 1798: 1794: 1788: 1773: 1769: 1762: 1747: 1743: 1736: 1721: 1717: 1711: 1696: 1692: 1685: 1677: 1673: 1668: 1663: 1659: 1655: 1651: 1647: 1643: 1636: 1628: 1624: 1619: 1614: 1609: 1604: 1600: 1596: 1592: 1585: 1570:. 13 May 2024 1569: 1565: 1559: 1557: 1548: 1544: 1540: 1536: 1532: 1526: 1522: 1518: 1514: 1510: 1503: 1488: 1484: 1478: 1476: 1474: 1472: 1455: 1451: 1447: 1441: 1437: 1428: 1425: 1423: 1420: 1419: 1410: 1405: 1402: 1397: 1393: 1389: 1386: 1382: 1381: 1380: 1378: 1373: 1364: 1362: 1358: 1354: 1350: 1346: 1342: 1336: 1335:Bat influenza 1326: 1321: 1311: 1308: 1302: 1292: 1287: 1277: 1275: 1270: 1268: 1264: 1260: 1256: 1252: 1241: 1238: 1234: 1233:aquatic birds 1228: 1216:Other animals 1213: 1211: 1207: 1202: 1200: 1196: 1187: 1177: 1167: 1165: 1161: 1160:immune system 1155: 1145: 1143: 1139: 1134: 1119: 1117: 1113: 1109: 1105: 1100: 1097: 1095: 1091: 1087: 1083: 1079: 1066: 1063: 1059: 1056: 1055: 1054: 1051: 1049: 1045: 1041: 1037: 1033: 1027: 1023: 1018: 1008: 1006: 1001: 997: 993: 991: 980: 977: 973: 968: 964: 960: 956: 946: 944: 940: 936: 930: 928: 927: 922: 921: 915: 913: 911: 910:Hong Kong flu 906: 905: 900: 899: 889: 885: 883: 879: 874: 869: 860: 846: 844: 840: 836: 834: 830: 826: 823: 819: 818:cap-snatching 815: 811: 809: 805: 801: 791: 788: 787: 783: 781: 778: 771: 767: 763: 761: 758: 757: 754: 750: 746: 744: 741: 734: 731: 727: 725: 722: 719: 716: 715: 712: 709: 707: 706: 699: 697: 694: 691: 688: 687: 683: 681: 678: 675: 672: 671: 667: 663: 659: 655: 652: 650: 648: 647: 643: 640: 637: 634: 633: 629: 626: 625: 622: 621: 615: 612: 605: 602: 600: 594: 590: 587: 584: 581: 580: 576: 573: 570: 567: 566: 563: 554: 552: 547: 542: 540: 535: 523: 521: 517: 513: 499: 494: 479: 467: 466: 461: 452: 451: 446: 438: 420: 414:The starting 413: 412: 407: 406: 405: 403: 399: 389: 385: 383: 379: 375: 374:neuraminidase 371: 370:hemagglutinin 367: 364: 355: 346: 344: 340: 325: 323: 319: 314: 310: 306: 302: 297: 295: 291: 287: 283: 279: 275: 270: 268: 264: 259: 257: 253: 249: 246: 243: 238: 236: 232: 228: 224: 220: 219: 214: 211: 207: 203: 202: 192: 191: 186: 183: 182: 179: 178: 174: 171: 170: 167: 166: 162: 159: 158: 155: 154: 150: 147: 146: 143: 142: 138: 135: 134: 131: 130: 126: 123: 122: 119: 118: 117:Orthornavirae 114: 111: 110: 107: 106: 102: 99: 96: 95: 92: 89: 86: 85: 80: 75: 71: 67: 63: 59: 54: 49: 45: 40: 37: 33: 30: 19: 7230: 7162: 7155: 7131: 7124:Pancreatitis 7106: 7094: 7082: 7070: 7063: 7044: 7019: 7012: 7005: 6993: 6972: 6935: 6921: 6882: 6875: 6861: 6855: 6823: 6822: 6816: 6796: 6782: 6768: 6739: 6715: 6697: 6652:Pericarditis 6644: 6613: 6599: 6572: 6553: 6511: 6496: 6477: 6463: 6442: 6425:Encephalitis 6394: 6367: 6348: 6327: 6293: 6279: 6240: 6226: 6144:Strep throat 6124:Otitis media 6066:Muscle aches 5919:Strep throat 5899:Otitis media 5476:India (2006) 5228: 5198:Reassortment 5115: 5096: 5071: 5062: 5048: 5007: 5003: 4989: 4927:. 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Retrieved 1449: 1440: 1374: 1370: 1356: 1344: 1338: 1323: 1304: 1289: 1271: 1267:asymptomatic 1258: 1254: 1250: 1247: 1230: 1203: 1192: 1157: 1141: 1140: 1136: 1101: 1098: 1075: 1052: 1031: 1030: 1025: 1011:Seasonal flu 988: 986: 983:Surveillance 967:reassortment 961:facilitates 952: 931: 924: 918: 916: 908: 902: 896: 894: 875: 871: 849:Epidemiology 838: 837: 813: 812: 797: 752: 729: 710: 703: 701: 668:production. 617: 596: 568:RNA Segment 560: 543: 536: 524: 519: 509: 474:A(H1N1)pdm09 401: 395: 386: 360: 336: 298: 278:muscle aches 271: 260: 256:reassortment 254:and genetic 239: 235:seasonal flu 216: 212: 200: 199: 198: 189: 188: 176: 175: 164: 152: 140: 128: 116: 104: 97: 87:(unranked): 35: 29: 7255:Wikispecies 7021:Coronavirus 6762:Common cold 6674:acute viral 6657:Myocarditis 6501:(probable) 6253:Anal cancer 6129:Pharyngitis 6086:Sore throat 6013:Enterovirus 6008:Coronavirus 5987:Common cold 5904:Pharyngitis 5850:Non-mammals 5631:Laninamivir 5626:Oseltamivir 5614:Rimantadine 5442:2009 A/H1N1 5244:Influenza D 5239:Influenza C 5234:Influenza B 5229:Influenza A 4488:"Horse Flu" 4247:"Avian flu" 3867:"Influenza" 3496:www.cdc.gov 2985:www.flu.com 2792:: 1323560. 2618:"Influenza" 1601:(8): 1650. 1084:(such as a 1040:Influenza B 965:by segment 955:RNA viruses 898:Spanish flu 882:Middle Ages 878:Hippocrates 843:RNA viruses 343:host animal 301:biosecurity 274:sore throat 7344:Categories 7148:Urogenital 7014:Astrovirus 6974:Adenovirus 6798:SARS-CoV-2 6555:Poliovirus 6430:meningitis 6076:Rhinorrhea 6018:Rhinovirus 6003:Adenovirus 5656:Umifenovir 5648:Peramivir 5609:Amantadine 5587:Treatments 5208:Flu season 4471:4 December 4088:24 January 3826:(1): 214. 3625:"zoonosis" 1446:"Taxonomy" 1433:References 1249:strain is 1199:runny nose 1048:subtropics 1032:Flu season 1017:Flu season 866:See also: 804:transcribe 747:Forms the 705:importin-α 666:interferon 593:polymerase 516:RNA genome 491:See also: 472:, it uses 240:IAV is an 221:. It is a 7059:RNA virus 7040:DNA virus 7032:Hepatitis 7007:Norovirus 6995:Rotavirus 6989:RNA virus 6968:DNA virus 6914:Esophagus 6842:Influenza 6728:RNA virus 6690:DNA virus 6459:RNA virus 6438:DNA virus 6344:RNA virus 6222:DNA virus 6214:Oncovirus 6139:Sinusitis 6134:Pneumonia 5914:Sinusitis 5909:Pneumonia 5805:Non-human 5772:Epidemics 5719:Pandemics 5710:epidemics 5689:Pandemrix 5641:Zanamivir 5636:Peramivir 5573:2020–2022 5566:Outbreaks 5481:UK (2007) 5464:Outbreaks 5408:Pandemics 5188:Treatment 5164:Influenza 5012:CiteSeerX 4774:202580293 3926:(1): 17. 2888:: 55–82. 2843:: 87–96. 1539:1940-6029 1409:modelling 1349:Guatemala 1176:influenza 1148:Treatment 1086:bacterium 1036:influenza 996:influenza 976:pandemics 943:spillover 926:Swine flu 920:H1N1pdm09 904:Asian flu 833:ribosomes 825:pre-mRNAs 808:replicate 577:Function 551:antigenic 506:Structure 432:(or just 363:antigenic 339:serotypes 313:influenza 305:antiviral 286:pneumonia 248:RNA virus 242:enveloped 229:and some 184:Species: 112:Kingdom: 105:Riboviria 7360:Zoonoses 7314:11460084 7301:10308782 7288:46700506 7240:Wikidata 7199:Medicine 7157:BK virus 6960:diarrhea 6804:COVID-19 6546:Myelitis 6091:Weakness 6081:Sneezing 6051:Headache 6028:Symptoms 5671:Vaccines 5256:subtypes 5178:Research 5034:16192482 4892:22967978 4843:26392163 4835:11576290 4798:24 March 4792:Archived 4766:31527796 4717:32298389 4579:31871238 4293:19618616 4155:15728170 4112:Archived 4082:Archived 3952:29370862 3901:32048225 3852:31189475 3775:38407173 3766:10902543 3637:29 March 3554:27119988 3514:PLOS ONE 3378:20568566 3300:16318689 3251:16306617 3202:20660197 2964:11919291 2867:28527860 2818:38152399 2809:10751371 2762:30079062 2736:: 1581. 2706:35993811 2652:29955068 2628:(1): 3. 2536:19230160 2480:27365089 2423:Archived 2295:25417656 2220:24130481 2161:Archived 2136:22075584 1912:27426214 1676:25417656 1627:28783091 1547:32170708 1454:Archived 1416:See also 1401:sequelae 1367:Research 1263:chickens 1082:pathogen 1078:zoonosis 1005:zoonotic 972:zoonotic 764:Forms a 662:cytokine 574:Protein 378:serotype 366:proteins 349:Subtypes 328:Virology 318:zoonotic 252:mutation 223:pathogen 160:Family: 124:Phylum: 7246:Q834390 7211:Viruses 7185:Portals 6910:Pharynx 6414:Central 6061:Malaise 6041:Fatigue 5995:Viruses 5812:Mammals 5522:Vaccine 5500:Science 5435:Science 5217:Viruses 5183:Vaccine 4929:28 June 4883:3448162 4757:7758811 4708:7161946 4664:30 June 4627:30 June 4602:30 June 4597:cdc.gov 4570:7778219 4528:25 June 4497:25 June 4438:25 June 4413:25 June 4387:25 June 4361:25 June 4256:25 June 4205:25 June 4179:25 June 4106:. 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Index

Influenzavirus A

Transmission electron micrograph of influenza A viruses (light objects on a dark background).
TEM
Virus classification
Edit this classification
Virus
Riboviria
Orthornavirae
Negarnaviricota
Insthoviricetes
Articulavirales
Orthomyxoviridae
Alphainfluenzavirus
species
genus
Orthomyxoviridae
pathogen
birds
mammals
seasonal flu
enveloped
negative-sense
RNA virus
mutation
reassortment
viral envelope
H1N1
sore throat
muscle aches

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