The infection is not transmitted person to person and is caused by the fungus Coccidioides immitis, which is found in soil in certain semiarid areas of North and South America.

• 这种病的感染不通过人际传播，而是由粗球霉菌造成，这种真菌存在于美国北部和南部一些半干旱区域的土壤中。