Valley fever


Valley fever is an infection that occurs when the spores of the fungus Coccidioides immitis enter your body through the lungs.


Valley fever is a fungal infection most commonly seen in the desert regions of the southwestern United States, and in Central and South America. You get it by breathing in the fungus from soil. The infection starts in the lungs. It commonly affects people over 60 years of age.

Valley fever may also be called coccidioidomycosis.

Traveling to an area where the fungus is commonly seen raises your risk for this infection. However, you're more likely to develop a serious infection if you live where the fungus is found and have a weakened immune system due to:

People of Native American, African, or Philippine descent may also come down with more severe cases.


Most people with valley fever never have symptoms. Others may have cold- or flu-like symptoms or symptoms of pneumonia. If symptoms occur, they typically start 5 to 21 days after exposure to the fungus.

Common symptoms include:

Rarely, the infection spreads from the lungs through the bloodstream to involve the skin, bones, joints, lymph nodes, and central nervous system or other organs. This spread is called disseminated coccidioidomycosis.

People with this more widespread form may become very sick. Symptoms may also include:

Skin lesions of valley fever are often a sign of widespread (disseminated) disease. With more widespread infection, skin sores or lesions are most often seen on the face.

Exams and Tests

The health care provider will perform a physical exam and ask about symptoms and travel history. Tests done for milder forms of this infection include:

Tests done for more severe or widespread forms of the infection include:


If you have a healthy immune system, the disease almost always goes away without treatment. Your provider may suggest bed rest and treatment for flu-like symptoms until your fever disappears.

If you have a weak immune system, you may need antifungal treatment with amphotericin B, fluconazole, or itraconazole. Itraconazole is the drug of choice in people with joint or muscle pain.

Sometimes surgery is needed to remove the infected part of the lung (for chronic or severe disease).

Outlook (Prognosis)

How well you do depends on the form of the disease you have and your overall health.

The outcome in acute disease is likely to be good. With treatment, the outcome is usually also good for chronic or severe disease (although relapses may occur). People with disease that has spread have a high death rate.

Possible Complications

Widespread valley fever may cause:

These problems are much more likely if you have a weakened immune system.

When to Contact a Medical Professional

Call for an appointment with your provider if you have symptoms of valley fever or if your condition does not improve with treatment.


People with immune problems (such as with HIV/AIDS and those who are on drugs that suppress the immune system) shouldn't go to areas where this fungus is found. If you already live in these areas, other measures that can be taken include:

Take preventive medicines as prescribed by your provider.

Review Date: 9/22/2018
Reviewed By: Jatin M. Vyas, MD, PhD, Assistant Professor in Medicine, Harvard Medical School; Assistant in Medicine, Division of Infectious Disease, Department of Medicine, Massachusetts General Hospital, Boston, MA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.

This information should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. © 1997- 2007 A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.