Overview

• As of July 31, California has reported 6,761 Valley Fever cases in 2025, placing the state on pace to exceed last year’s 12,595 total.
• Sacramento County is up 26%, San Joaquin 83%, and Stanislaus 62% compared with the 2023–2024 average, according to state data.
• Monterey County recorded the steepest percentage rise, increasing 264% year over year to 348 cases by the end of July.
• The infection stems from inhaling dust that contains Coccidioides spores in disturbed soil, and it does not spread person to person.
• Public health guidance urges minimizing dust exposure, wetting soil before digging, and wearing masks, with extra precautions for outdoor workers and high‑risk individuals.