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Coccidioides posadasii : ウィキペディア英語版 | Coccidioides posadasii
''Coccidioides posadasii'' is a pathogenic fungus that, along with ''Coccidioides immitis'', is the causative agent of coccidioidomycosis, or valley fever in humans. It resides in the soil in certain parts of the Southwestern United States, northern Mexico, and some other areas in the Americas, but its evolution was connected to its animal hosts. ''C. posadasii'' and ''C. immitis'' are morphologically identical, but genetically and epidemiologically distinct. ''C. posadasii'' was identified as a separate species other than ''C. immitis'' in 2002 after a phylogenetic analysis. The two species can be distinguished by DNA polymorphisms and different rates of growth in the presence of high salt concentrations: ''C. posadasii'' grows more slowly. It is also differs epidemiologically, since it is found outside the San Joaquin Valley. Unlike ''C. immitis'', which is geographically largely limited to California, ''C. posadasii'' can also be found in northern Mexico and South America. ==References==
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