Abstract
Coccidioidomycosis was found in wild rodents in additional localities in Arizona. It was not found in an area examined in New Mexico. Rodents appear to constitute a natural reservoir of the disease, and the presence of susceptible spp. may explain the endemicity of coccidioidomycosis. Examination and culture of the lungs from samples of the rodent population (particularly of species of Perognathus) offers a quick and dependable method of determining whether Coccidioides is present in a locality. This information may be of value in deciding whether unnecessary risk is involved in the concentration in certain areas of individuals from non-endemic areas.