histoplasmosis, caused by "histoplasma capsulatum", is a disease with a worldwide distribution. in the united states it is mainly found in the mississippi and ohio river areas, most commonly in bird and bat feces. signs include weight loss, cough, fever, enlarged lymph nodes, and gastrointestinal symptoms. coccidioidomycosis, caused by "coccidioides immitis", is found in arid and semi-arid regions of central and south america, mexico, and southwestern united states. signs include weight loss, fever, cough, enlarged lymph nodes, and lameness.