Valley fever (also called coccidioidomycosis or “cocci”) is a disease caused by a fungus that grows in the
soil and dirt in some areas of California and the southwestern United States. People and animals can get sick when they breathe in dust that contains the Valley fever fungus. This fungus usually infects
the lungs and can cause respiratory symptoms including cough, fever, chest pain, and tiredness.
In California, the number of reported Valley fever cases has greatly increased in recent years. In fact, Valley fever cases tripled from 2014–2018, and from 2018–2022, between 7,000 and 9,000 cases were reported each year.
Most cases of Valley fever in California are reported from the Central Valley and Central Coast regions. But Valley fever cases have also been increasing outside of these regions as California experiences more drought. Valley fever cases are on the rise in California, including in the northern Central Valley and southern coastal areas of California. Learn more about how drought impacts Valley fever in California.
CDPH Press Release – August 1, 2023
MMWR – August 26, 2022
Am J Ind Med – January 23, 2021
MMWR – December 4, 2020
CDPH Press Release – December 2, 2020