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Valley Fever

Valley fever is on the rise in California. Learn what it is. Learn the symptoms. Learn how to help prevent it.
  • Could Be Valley Fever
  • Valley Fever Basics
  • Symptoms
  • Groups at Risk
  • Prevention Tips
  • Diagnosis and Outcomes
  • Talking to a Doctor
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  • Pets and Other Animals
  • +Valley Fever Resources
    • Information for Outdoor Workers & Employers
    • Information for Providers & Local Health Departments
    • Awareness & Outreach Toolkit for Local Partners
    • Educational Resources
  • La Fiebre del Valle en Español
  • Valley Fever sa Tagalog
en Español sa Tagalog


Valley Fever is on the Rise

In California, the number of reported Valley fever cases has greatly increased in recent years. Valley fever cases tripled from 2014–2018, and from 2018–2022, between 7,000 and 9,000 cases were reported each year.


To see recent data, view CDPH Valley Fever Data and Publications



The Valley fever fungus can infect people who work or dig outdoors in certain areas in California, including wildland firefighters digging and moving soil to control fires.
Fire safety crews working in California should learn about Valley fever and know the symptoms, which sometimes appear weeks after exposure to dust outdoors.

Learn more: Groups at Risk | Symptoms | Resources for Outdoor Workers & Employers

What is Valley fever?

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.

Valley fever transmission: The Valley fever fungus grows in dirt and soil, but is too small to see; fungus spores get in the air when dust is stirred up by the wind or by digging; people an animals breathe in the spores from dust in the air; the fungus usually infects the lungs, but it can spread to other organs.

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.


Learn More

  • VALLEY FEVER BASICS

  • SYMPTOMS

  • GROUPS AT RISK

  • PREVENTION TIPS

    Resources

    Information for outdoor workers
    • Information for Providers and Local Health Departments
    • Data and Publications
    • Awareness and Outreach Toolkit for Local Partners
    • CDC Valley Fever (Coccidioidomycosis) Website
    Valley fever educational resources

News and Updates

  • During Valley Fever Awareness Month, CDPH Warns of Increased Risk through Fall​​​​

    CDPH Press Release – August 29, 2024

  • CDPH Identifies Valley Fever Illness Among Attendees of Kern County Music Festival

    CDPH Press Release – July 29, 2024

  • Potential Increased Risk for Valley Fever Expected

    CDPH Press Release – August 1, 2023

  • Notes From the Field: Coccidioidomycosis Outbreak Among Wildland Firefighters — California, 2021

    MMWR – August 26, 2022

  • Valley Fever Cases Reach Record High in California in 2019

    CDPH Press Release – December 2, 2020

Page Last Updated : January 17, 2025
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