FIG 6 .
Model for Coccidioides dispersal in the Western Hemisphere. A proposed dispersal model for C. posadasii from a hypothetical founder population in southern Arizona (South AZ)-northern Mexico and C. immitis from a hypothetical founder population in California’s Central Valley (Central CA Valley) is shown in conjunction with a timeline (labeled in thousands of years ago [kya]) that is color coded to match dispersal paths and annotated with the timing of great American biotic interchange (GABI) events 3 and 4, as well as of the final draining of the Central California basin. Central Am., Central America; South Am., South America; SE, southeastern; Mx, Mexico.