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Blastomyces dermatitidis

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33: 441:, including metropolitan Toronto, and, most notably, has areas of high endemicity throughout northern Ontario. Remarkably high incidence is noted for some parts of the Kenora area and climatologically similar areas of northwestern Ontario. To the west, the range of endemic blastomycosis extends across southern Manitoba and into adjacent Saskatchewan. A few cases have been reported from north central Alberta, e.g., the Edmonton area, though in these cases an atypical genetic group of the fungus may be involved. 374:(sexual spores) are produced in small round reproductive sacs (asci). The ascospores, at 1.5โ€“2.0 ฮผm, are among the smallest reproductive particles produced by fungi, and are within the respirable size range. The budding yeast cells seen in infected tissues and bodily fluids are generally relatively large (c. 8โ€“15 ฮผm) and characteristically bud through a broad base or neck, making them highly recognizable to the pathologist. A small ("nanic") form is rarely seen with cells under 6 ฮผm. 54: 466:
by sacrifice of the animals when they appear ill or at the end of six weeks. The internal organs of the mice are then checked microscopically for evidence of blastomycosis. Needless to say, the cost and complexity of performing such studies is imposing, especially as the ethical clearance procedures for work involving animals become ever more involved. More direct and economical mycological techniques for environmental isolation, such as
366:(asexual spores). These conidia are probably the main infectious particles produced by the fungus. They form on individual short stalks and readily become airborne when the colony is disturbed; their size places them well within the respirable size range for particles, meaning that they can deposit deeply in the lungs when inhaled. Sexual reproduction by the fungus requires the meeting of colonies of + and โ€“ 263:, a potentially very serious disease that typically begins with a characteristically subtle pneumonia-like infection that may progress, after 1โ€“6 months, to a disseminated phase that causes lesions to form in capillary beds throughout the body, most notably the skin, internal organs, central nervous system and bone marrow. The sexual form of this fungus was formerly known as 370:, probably a relatively rare event, and results in the production of small ascomata (sexual fruiting bodies) 200โ€“350 ฮผm, looking, to the naked eye, similar to a woollen fuzz ball, and in microscopic view consisting of a layer of spiralling, springy guard hairs surrounding a fertile core in which groups of 8 191:, an invasive and often serious fungal infection found occasionally in humans and other animals. It lives in soil and wet, decaying wood, often in an area close to a waterway such as a lake, river or stream. Indoor growth may also occur, for example, in accumulated debris in damp sheds or shacks. The fungus is 449:
antigens, while southern African isolates lack the A antigen. Isolates from the middle east possess both antigens. The sub-Saharan African isolates differ in the laboratory from other isolates by being exceedingly difficult to convert to the yeast phase, and they also show some enzymatic distinctions.
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may associate in nature with one or more indigenous North American mammalian host species. To date, however, all the animal species that have been subjected to focused investigation have been exonerated of this specific connection. Unsubstantiated suspicion has particularly focused on the beaver, but
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One of the unexplained regularities of nature is that there are several fungi of different phylogenetic ancestry that show a similar pattern of existence: dimorphism (conversion from a filamentous form in the environment to a yeast form in warm-blooded host tissues), virulent pathogenesis (ability to
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itself is a sexual organism, occurring in nature as both a + mating type and a โˆ’ mating type. This is epidemiologically important for two reasons: firstly, it implies that the organism will be genetically variable, potentially leading to variations in disease severity, treatment response and habitat
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and the Indian subcontinent. Though it has never been directly observed growing in nature, it is thought to grow there as a cottony white mold, similar to the growth seen in artificial culture at 25 ยฐC (77 ยฐF). In an infected human or animal, however, it converts in growth form and becomes
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has only been isolated from the environment 21 times. Most of these isolations have been based on the arduous isolation techniques involving the suspension of soil or other environmental materials in aqueous medium with antibacterial antibiotics, and injection of mice with these materials, followed
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is one of the most ecologically mysterious organisms causing human and animal disease. Prediction of disease risk and prevention of disease are both made extraordinarily difficult by our very poor understanding of where and how this organism normally grows in nature. Despite decades of attempts at
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tends to be associated with soils and wood debris in areas "characterized by an acidic pH, high organic content (due to rotting or decayed wood or vegetation and animal or bird droppings), abundant moisture, and proximity to waterways". Recent PCR detections, for example, concerned a Kentucky dog
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occurs at low levels in various parts of Africa, from Algeria to South Africa, as well as in and near the Arabian Peninsula. The African isolates are divided into two biologically different antigen groups: isolates from north of the Sahara are similar to North American isolates in having A and K
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is largely focused around the waterways of the St. Lawrence and Mississippi River systems of North America. There is a widely distributed and much republished, partially erroneous map that shows the U.S. portion of this range accurately, inclusive of occurrence in Minnesota, Wisconsin, Ohio,
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Avoidance of exposure in endemic areas is the principal means of disease prevention. Because the agent is known to distribute in dusts, the minimization of dust-generating activities, such as digging, sweeping, etc., is key. Although a method of soil decontamination has been described and
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preference; secondly, it implies that a suitable, stable habitat must exist for the complex process of sexual reproduction to take place. This habitat is as yet unknown. In its asexual form, the fungus grows as a typical colonial microfungus, comparable to
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will grow readily from clinical samples on common laboratory media, the lack of success in isolating it from environmental materials is generally ascribed to the inhibitory effects of co-occurring common molds and antibiotic-resistant bacteria.
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cause a significant infection in an animal host that is otherwise in good health), pulmonary infectivity (infection mainly via the lungs) and sharply delimited endemism (occurrence in only a limited geographic range.).
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Klein, Bruce S.; Vergeront, James M.; Weeks, Robert J.; Kumar, U. Nanda; Mathai, George; Varkey, Basil; Kaufman, Leo; Bradsher, Robert W.; Stoebig, James F.; Davis, Jeffrey P. (1986). "Isolation of
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Ajello, L., and R. J. Weeks. 1983. Soil decontamination and other control measures. Pp. 229-238. In A. F. DiSalvo (ed.), Occupational Mycoses. Lea and Febiger, Philadelphia, Pennsylvania.
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Dwight, P.J.; Naus, M; Sarsfield, P; Limerick, B (2000). "An outbreak of human blastomycosis: the epidemiology of blastomycosis in the Kenora catchment region of Ontario, Canada".
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Kentucky, Arkansas, Tennessee, North and South Carolina, the Virginias, Mississippi, Louisiana, and a few regions of states adjacent to those named. The Canadian range of
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kennel where 35 of 100 dogs had contracted blastomycosis. Previous isolations have been from comparable sites such as soil and wood debris from an abandoned Wisconsin
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Chaturvedi, VP; Randhawa, HS; Kini, S; Khan, ZU (1986). "Survival of Blastomyces dermatitidis in the gastrointestinal tract of an orally infected insectivorous bat,
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Baumgardner, DJ; Buggy, BP; Mattson, BJ; Burdick, JS; Ludwig, D (1992). "Epidemiology of blastomycosis in a region of high endemicity in north central Wisconsin".
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and the low endemicity in southeastern corner of Manitoba. Though the Quebec distribution is reasonably accurate, the rest of Canada is strongly misrepresented.
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Brown, Elizabeth M.; McTaggart, Lisa R.; Zhang, Sean X.; Low, Donald E.; Stevens, David A.; Richardson, Susan E.; Litvintseva, Anastasia P. (22 March 2013).
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shows an abundance of blastomycosis in broad areas north and south of the St. Lawrence River in Quebec, as well as high endemicity along the north shore of
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have also been focal points of interest, with no conclusive interspecies association being demonstrated to date. The closely related pathogenic fungus
338:": fungi that switch from a mold-like (filamentous) growth form in the natural habitat to a yeast-like growth form in the warm-blooded animal host. 755: 717:
Size-selective health hazard sampling. Pp. . In BS Cohen, CS McCammon (eds.), Air Sampling Instruments, 9th edition. ACGIH Press, Cincinnati, Ohio
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that penetrates the substratum on which it grows, and then after 3โ€“5 days of growth begins to reproduce asexually with small (2โ€“10 ฮผm)
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demonstrated to be effective, it uses hazardous chemicals and its use is best reserved for situations that cannot be managed otherwise.
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Baumgardner, DJ; Summerbell, R; Krajden, S; Alexopoulou, I; Agrawal, B; Bergeson, M; Fuksa, M; Bemis, C; Baumgardner, MA (2005).
1561: 1734: 719:. Cincinnati, Ohio: in BS Cohen, CS McCammon (eds.), Air Sampling Instruments, 9th edition. ACGIH Press. pp. 93โ€“134. 739: 526:
in South America has a well substantiated, though not well understood, ecological link with the nine-banded armadillo,
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culture was gained via use of a novel enrichment broth technique. Recently, in an important breakthrough, a specific
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Bennett, John E. (2014). "Introduction to Mycoses". In John E. Bennett; Raphael Dolin; Martin J. Blaser (eds.).
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Sekhon, AS; Jackson, FL; Jacobs, HJ (1982). "Blastomycosis: report of the first case from Alberta Canada".
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once it is correctly diagnosed; however, delayed diagnosis is very common except in highly endemic areas.
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in three environmental samples from a dog kennel that had been experiencing problems with blastomycosis.
53: 1636: 1450:"Expanding epidemiology of blastomycosis: clinical features and investigation of 2 cases in Colorado" 487: 1542: 665:
Untereiner, Wendy A.; Scott, James A.; Naveau, F.; Sigler, Lynne; Bachewich, J.; Angus, A. (2004).
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is absent or nearly so from the Lake Erie area, but occurs sporadically on the north shore of
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Lester, RS; DeKoven, JG; Kane, J; Simor, AE; Krajden, S; Summerbell, RC (2000).
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Mandell, Douglas, and Bennett's Principles and Practice of Infectious Diseases
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What has been learned from direct isolation and recent PCR studies is that
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in soil associated with a large outbreak of blastomycosis in Wisconsin".
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Frean, JA; Carman, WF; Crewe-Brown, HH; Culligan, GA; Young, CN (1989). "
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South African Medical Journal = Suid-Afrikaanse Tydskrif vir Geneeskunde
667:"The Ajellomycetaceae, a new family of vertebrate-associated Onygenales" 1649: 932: 690: 608:, sp. nov. within the Human Pathogenic Fungus Blastomyces dermatitidis" 503: 371: 228: 105: 85: 231:. In addition, it occurs rarely in Africa both north and south of the 1675: 1408: 510:
was also accomplished from an earthen floor indoors on one occasion.
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Bradsher, RW (1987). "Water and blastomycosis: don't blame beaver".
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Baumgardner, DJ; Paretsky, DP (1999). "The in vitro isolation of
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to parts of eastern North America, particularly boreal northern
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There has been a long history of justifiable speculation that
506:, and woody materials from a Wisconsin woodpile. Isolation of 244:. Blastomycosis is generally readily treatable with systemic 215:
and interconnected eastern mountain chains, the west bank of
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including the valleys of some major tributaries such as the
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De Groote, MA; Bjerke, R; Smith, H; Rhodes III, LV (2000).
1226: 992: 918: 771:"Novel cases of blastomycosis acquired in Toronto, Ontario" 664: 730:
Kwon-Chung, K.J., Bennett, J.E.; Bennett, John E. (1992).
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DiSalvo, A.F. (1992). Al-Doory, Y.; DiSalvo, A.F. (eds.).
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10.1580/1080-6032(1996)007[0192:ltte]2.3.co;2
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Vergara, ML; Martinez, R (1999). "Role of the armadillo
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Along with two other important human-pathogenic fungi,
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from an earthen floor in southwestern Ontario, Canada"
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In nature, the fungus forms a network of thread-like
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In 2013, a second species was described in the genus
1053:"PCR-based detection of DNA from the human pathogen 810:
Kane, J; Righter, J; Krajden, S; Lester, RS (1983).
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http://pathmicro.med.sc.edu/mycology/mycology-6.htm
1488: 1115:from a woodpile in north central Wisconsin, USA". 1106: 1104: 536:has no close relatives in the geographic range of 604:"Phylogenetic Analysis Reveals a Cryptic Species 1716: 1493:in the epidemiology of paracoccidioidomycosis". 490:technique was developed that was able to detect 1357: 1315:Gaus, DP; Baumgardner, DJ; Paretsky, D (1996). 1220: 1143: 1101: 461:isolating organisms from epidemiological foci, 1402: 1370:from native shrews in northern Wisconsin, USA" 1046: 1044: 1042: 986: 812:"Blastomycosis: a new endemic focus in Canada" 1094: 1092: 710: 708: 658: 565: 563: 561: 1558:Mycology Online ยง Dimorphic Fungal Pathogens 1441: 1273: 1183: 1181: 993:Summerbell, RC; Kane, J; Pincus, DH (1990). 754:: CS1 maint: multiple names: authors list ( 723: 1482: 1227:Bakerspigel, A; Kane, J; Schaus, D (1986). 1039: 871: 251: 1415:Journal of Medical and Veterinary Mycology 1282:The American Review of Respiratory Disease 1089: 1051:Burgess, JW; Schwan, WR; Volk, TJ (2006). 912: 705: 558: 482:In just one experiment, a single positive 470:, have never yielded positive results for 355:mold forms commonly seen on mouldy bread. 287:. Three more species have been described: 31: 1541:at the U.S. National Library of Medicine 1465: 1385: 1340: 1256: 1178: 1072: 1022: 955: 895: 878:Vallabh, V; Martin, T; Conly, JM (1988). 844: 827: 786: 762: 641: 631: 591:. Elsevier Health Sciences. p. 2874. 1560:. University of Adelaide. Archived from 1308: 1279: 595: 1329:Wilderness & Environmental Medicine 803: 714: 584: 569: 1717: 543: 387:is one of these fungi; the others are 1585: 1584: 532:. This member of the mammalian order 816:Canadian Medical Association Journal 775:Canadian Medical Association Journal 378:Geographic distribution and variants 734:. Philadelphia: Lea & Febiger. 572:Ecology of Blastomyces dermatitidis 13: 853:Canada Communicable Disease Report 14: 1751: 1532: 1321:from rectal cultures of beaver ( 1237:Journal of Clinical Microbiology 1129:10.1111/j.1365-280x.1999.00214.x 1003:Journal of Clinical Microbiology 52: 1411:Rhinopoma hardwickei hardwickei 1325:) from north central Wisconsin" 1194:New England Journal of Medicine 1015:10.1128/jcm.28.5.1054-1056.1990 884:The Western Journal of Medicine 880:"Blastomycosis in Saskatchewan" 578: 1: 1249:10.1128/jcm.24.5.890-891.1986 552: 396:Paracoccidioides brasiliensis 317:Paracoccidioides brasiliensis 1454:Clinical Infectious Diseases 1152:Clinical Infectious Diseases 633:10.1371/journal.pone.0059237 7: 1206:10.1056/NEJM198602273140901 518:the shrew, the bat and the 10: 1756: 1735:Fungal pathogens of humans 1057:from natural soil samples" 452: 444:In the rest of the world, 1593: 1427:10.1080/02681218680000521 1387:10.1080/13693780400008191 1294:10.1164/ajrccm/136.6.1324 1074:10.1080/13693780600954749 574:. Plenum. pp. 43โ€“73. 154: 147: 49:Scientific classification 47: 39: 30: 23: 1595:Blastomyces dermatitidis 1552:Blastomyces dermatitidis 1543:Medical Subject Headings 1368:Blastomyces dermatitidis 1366:"Attempted isolation of 1319:Blastomyces dermatitidis 1317:"Attempted isolation of 1231:Blastomyces dermatitidis 1190:Blastomyces dermatitidis 1113:Blastomyces dermatitidis 1055:Blastomyces dermatitidis 997:Ajellomyces dermatitidis 966:infections in the RSA". 964:Blastomyces dermatitidis 458:Blastomyces dermatitidis 435:Blastomyces dermatitidis 420:The geographic range of 385:Blastomyces dermatitidis 340:Blastomyces dermatitidis 257:Blastomyces dermatitidis 252:Morphology and phylogeny 180:Blastomyces dermatitidis 158:Blastomyces dermatitidis 41:Blastomyces dermatitidis 25:Blastomyces dermatitidis 1730:Fungi described in 1898 1507:10.1023/A:1007034215003 606:Blastomyces gilchristii 259:is the causal agent of 1164:10.1093/clind/15.4.629 390:Histoplasma capsulatum 311:Histoplasma capsulatum 414:Talaromyces marneffei 330:belong to the family 302:Blastomyces percursus 213:Appalachian mountains 1491:Dasypus novemcinctus 529:Dasypus novemcinctus 402:Coccidioides immitis 323:Polytolypa hystricis 290:Blastomyces emzantsi 235:, as well as in the 211:, parts of the U.S. 140:B. dermatitidis 715:Lippman, M (2001). 624:2013PLoSO...859237B 544:Preventive measures 933:10.1007/bf00468081 296:Blastomyces parvus 225:Mississippi Valley 209:St. Lawrence River 1712: 1711: 1697:Open Tree of Life 1587:Taxon identifiers 1323:Castor canadensis 237:Arabian Peninsula 223:, and the entire 176: 175: 16:Species of fungus 1747: 1705: 1704: 1692: 1691: 1679: 1678: 1666: 1665: 1653: 1652: 1640: 1639: 1627: 1626: 1614: 1613: 1612: 1582: 1581: 1572: 1570: 1569: 1527: 1526: 1486: 1480: 1479: 1469: 1445: 1439: 1438: 1406: 1400: 1399: 1389: 1374:Medical Mycology 1361: 1355: 1354: 1344: 1312: 1306: 1305: 1277: 1271: 1270: 1260: 1224: 1218: 1217: 1185: 1176: 1175: 1147: 1141: 1140: 1117:Medical Mycology 1108: 1099: 1096: 1087: 1086: 1076: 1061:Medical Mycology 1048: 1037: 1036: 1026: 990: 984: 983: 959: 953: 952: 916: 910: 909: 899: 875: 869: 868: 848: 842: 841: 831: 807: 801: 800: 790: 766: 760: 759: 753: 745: 732:Medical Mycology 727: 721: 720: 712: 703: 702: 662: 656: 655: 645: 635: 599: 593: 592: 582: 576: 575: 567: 468:dilution plating 332:Ajellomycetaceae 246:antifungal drugs 185:dimorphic fungus 160: 116:Ajellomycetaceae 57: 56: 35: 21: 20: 1755: 1754: 1750: 1749: 1748: 1746: 1745: 1744: 1715: 1714: 1713: 1708: 1700: 1695: 1687: 1682: 1674: 1669: 1661: 1656: 1648: 1643: 1635: 1630: 1622: 1617: 1608: 1607: 1602: 1589: 1567: 1565: 1548: 1535: 1530: 1487: 1483: 1446: 1442: 1407: 1403: 1362: 1358: 1313: 1309: 1278: 1274: 1225: 1221: 1186: 1179: 1148: 1144: 1109: 1102: 1097: 1090: 1049: 1040: 991: 987: 960: 956: 917: 913: 876: 872: 849: 845: 808: 804: 781:(10): 1309โ€“12. 767: 763: 747: 746: 742: 728: 724: 713: 706: 683:10.2307/3762114 663: 659: 600: 596: 583: 579: 568: 559: 555: 546: 538:B. dermatitidis 524:P. brasiliensis 515:B. dermatitidis 508:B. dermatitidis 499:B. dermatitidis 492:B. dermatitidis 484:B. dermatitidis 476:B. dermatitidis 463:B. dermatitidis 455: 446:B. dermatitidis 427:B. dermatitidis 422:B. dermatitidis 380: 336:dimorphic fungi 285:B. dermatitidis 254: 240:a large-celled 219:, the state of 199:, southeastern 172: 162: 156: 143: 51: 17: 12: 11: 5: 1753: 1743: 1742: 1740:Fungus species 1737: 1732: 1727: 1710: 1709: 1707: 1706: 1693: 1680: 1667: 1654: 1641: 1628: 1615: 1599: 1597: 1591: 1590: 1579: 1578: 1573: 1546: 1534: 1533:External links 1531: 1529: 1528: 1495:Mycopathologia 1481: 1467:10.1086/313717 1440: 1401: 1356: 1307: 1272: 1229:"Isolation of 1219: 1200:(9): 529โ€“534. 1177: 1142: 1100: 1088: 1038: 985: 954: 921:Mycopathologia 911: 870: 843: 802: 761: 741:978-0812114638 740: 722: 704: 657: 594: 577: 556: 554: 551: 545: 542: 474:growth. Since 454: 451: 379: 376: 280:B. gilchristii 253: 250: 174: 173: 163: 152: 151: 145: 144: 137: 135: 131: 130: 123: 119: 118: 113: 109: 108: 103: 99: 98: 96:Eurotiomycetes 93: 89: 88: 83: 79: 78: 73: 69: 68: 63: 59: 58: 45: 44: 37: 36: 28: 27: 15: 9: 6: 4: 3: 2: 1752: 1741: 1738: 1736: 1733: 1731: 1728: 1726: 1723: 1722: 1720: 1703: 1698: 1694: 1690: 1685: 1681: 1677: 1672: 1668: 1664: 1659: 1655: 1651: 1646: 1642: 1638: 1633: 1629: 1625: 1620: 1616: 1611: 1605: 1601: 1600: 1598: 1596: 1592: 1588: 1583: 1577: 1574: 1564:on 2007-08-17 1563: 1559: 1555: 1553: 1547: 1544: 1540: 1537: 1536: 1524: 1520: 1516: 1512: 1508: 1504: 1500: 1496: 1492: 1485: 1477: 1473: 1468: 1463: 1459: 1455: 1451: 1444: 1436: 1432: 1428: 1424: 1421:(4): 349โ€“52. 1420: 1416: 1412: 1405: 1397: 1393: 1388: 1383: 1379: 1375: 1371: 1369: 1360: 1352: 1348: 1343: 1338: 1334: 1330: 1326: 1324: 1320: 1311: 1303: 1299: 1295: 1291: 1288:(6): 1324โ€“6. 1287: 1283: 1276: 1268: 1264: 1259: 1254: 1250: 1246: 1242: 1238: 1234: 1232: 1223: 1215: 1211: 1207: 1203: 1199: 1195: 1191: 1184: 1182: 1173: 1169: 1165: 1161: 1158:(4): 629โ€“35. 1157: 1153: 1146: 1138: 1134: 1130: 1126: 1122: 1118: 1114: 1107: 1105: 1095: 1093: 1084: 1080: 1075: 1070: 1066: 1062: 1058: 1056: 1047: 1045: 1043: 1034: 1030: 1025: 1020: 1016: 1012: 1009:(5): 1054โ€“6. 1008: 1004: 1000: 998: 989: 981: 977: 973: 969: 965: 958: 950: 946: 942: 938: 934: 930: 926: 922: 915: 907: 903: 898: 893: 889: 885: 881: 874: 866: 862: 859:(10): 82โ€“91. 858: 854: 847: 839: 835: 830: 825: 822:(7): 728โ€“31. 821: 817: 813: 806: 798: 794: 789: 784: 780: 776: 772: 765: 757: 751: 743: 737: 733: 726: 718: 711: 709: 700: 696: 692: 688: 684: 680: 677:(4): 812โ€“21. 676: 672: 668: 661: 653: 649: 644: 639: 634: 629: 625: 621: 618:(3): e59237. 617: 613: 609: 607: 598: 590: 589: 581: 573: 566: 564: 562: 557: 550: 541: 539: 535: 531: 530: 525: 521: 516: 511: 509: 505: 500: 495: 493: 489: 485: 480: 477: 473: 469: 464: 459: 450: 447: 442: 440: 436: 432: 428: 423: 418: 416: 415: 410: 409: 404: 403: 398: 397: 392: 391: 386: 375: 373: 369: 365: 361: 356: 354: 353: 348: 347: 341: 337: 333: 329: 326:, species of 325: 324: 319: 318: 313: 312: 306: 304: 303: 298: 297: 292: 291: 286: 282: 281: 276: 271: 269: 267: 262: 261:blastomycosis 258: 249: 247: 243: 242:budding yeast 238: 234: 233:Sahara Desert 230: 226: 222: 218: 217:Lake Michigan 214: 210: 207:south of the 206: 202: 198: 194: 190: 189:blastomycosis 186: 182: 181: 170: 166: 161: 159: 153: 150: 149:Binomial name 146: 142: 141: 136: 133: 132: 129: 128: 124: 121: 120: 117: 114: 111: 110: 107: 104: 101: 100: 97: 94: 91: 90: 87: 84: 81: 80: 77: 74: 71: 70: 67: 64: 61: 60: 55: 50: 46: 43:, yeast form 42: 38: 34: 29: 26: 22: 19: 1594: 1566:. 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Index


Scientific classification
Edit this classification
Eukaryota
Fungi
Ascomycota
Eurotiomycetes
Onygenales
Ajellomycetaceae
Blastomyces
Binomial name
Gilchrist
W.R.Stokes
dimorphic fungus
blastomycosis
endemic
Ontario
Manitoba
Quebec
St. Lawrence River
Appalachian mountains
Lake Michigan
Wisconsin
Mississippi Valley
Ohio River
Sahara Desert
Arabian Peninsula
budding yeast
antifungal drugs
blastomycosis

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