En español
Valley fever is a lung infection caused by a fungus that lives in the top 12 inches of soil. We may breathe in the fungus, which is too small to see with our eyes, when the soil is disturbed. The fungus that causes Valley fever is common in Arizona, California, and Nevada. In fact, nearly all cases of Valley fever in the US are in people in Arizona and California. In California, Valley fever is especially prevalent in the Central Valley and Central Coast.