(Valley Fever)

Pronounced: kok-sid-ee-oyd-oh-mi-co-sis


Coccidioidomycosis, commonly called valley fever, is a potentially serious lung infection.


Valley fever is caused by a fungal infection. The fungus that causes valley fever is found in the soil, most commonly in the southwestern US, Mexico, and parts of Central and South America. Though the fungus lives in the soil, it is transported through the air and into the lungs, where it infects people who breathe it in. When soil that contains the fungus is disturbed, spores are released into the air.

The disease cannot be transmitted from person to person.

Risk Factors

People who are at increased risk of exposure to the fungus include:

  • Farmers
  • Construction workers
  • People in the military
  • Archaeologists
  • People who work with or who are frequently exposed to soil, especially in the form of dust

Those at increased risk of getting valley fever after exposure include:

  • People with weakened immune systems
  • Elderly people
  • African Americans
  • Asians
  • Women in the third trimester of pregnancy


Most people have no symptoms of valley fever. If present symptoms may include:

  • Cough
  • Fever
  • Chest pain
  • Shortness of breath
  • Chill
  • Flu-like symptoms that lasts for weeks or a month, including
    • Night sweats
    • Headache
    • Aching in the joints
  • Rash that consists of painful red bumps
  • Fatigue that lasts longer than a few weeks

The fungus can affect other parts of the body besides the lungs, and is called disseminated valley fever.


You will be asked about your symptoms and medical history. A physical exam will be done. Your doctor may ask about recent travel.

Your bodily fluids may be tested. This can be done with:

  • Blood tests
  • Sputum smear or culture
  • Spinal fluid analysis if there are neurologic symptoms
  • Tests from other infected sites

X-rays or CT scan may be done to see how much your lungs have been affected.


Talk with your doctor about the best treatment plan for you. Treatment options include:

  • Bed rest and fluids—Many people with valley fever do not need treatment with medication. The infection will go away on its own. Bed rest and drinking plenty of fluids will quicken recovery.
  • Antifungal medication—May be prescribed for those with weakened immune systems, chronic diseases, severe pneumonia, disseminated valley fever, meningitis, or primary infection in third trimester of pregnancy.


To help reduce your chances of valley fever:

  • Always wear an N95 dust respirator mask when working in the soil or in dusty areas like construction sites.
  • Promptly clean wounds with soap and water, especially if they had contact with dust or soil.
  • Avoid activiities that put you in contact with soil, such as gardening or digging..
  • Stay indoors during dust storms. Seal windows and doors tightly.
  • If you have a suppressed immune system or other risk factors, talk to your doctor about taking preventive medications.
  • Talk to your doctor about recombinant coccidioidal protein antigens that may offer protection like a vaccine. Vaccine options are currently being evaluated in clinical trials.

Family Doctor—American Academy of Family Physicians

Valley Fever


Health Canada

The College of Family Physicians of Canada


About valley fever. Valley Fever Center for Excellence website. Available at Updated January 2015. Accessed December 11, 2017.

Ampel NM. New perspectives on coccidioidomycosis. Proc Am Thorac Soc. 2010;7(3):181-185.

Ampel NM, Giblin A, Mourani JP, Galgiani JN. Factors and outcomes associated with the decision to treat primary pulmonary coccidioidomycosis. Clin Infect Dis. 2009;48(2):172-178.

Coccidioidomycosis. EBSCO DynaMed Plus website. Available at: Updated November 22, 2017. Accessed December 11, 2017.

Fisher BT, Chiller TM, Prasad PA, et al. Hospitalizations for coccidioidomycosis at forty-one children's hospitals in the United States. Pediatr Infect Dis J. 2010;29(3):243-247.

Hector RF, Rutherford GW, Tsang CA, et al. The public health impact of coccidioidomycosis in Arizona and California. Int J Environ Res Public Health. 2011;8(4):1150-1173.

Valley fever (coccidioidomycosis) risk & prevention. Centers for Disease Control and Prevention website. Available at: Updated January 25, 2017. Accessed December 11, 2017.

Last reviewed November 2018 by EBSCO Medical Review Board David L. Horn, MD, FACP  Last Updated: 12/9/2015