A disease that thrives as the climate worsens
California is once again grappling with a troubling surge in Valley Fever cases, and the numbers suggest this year may be the worst yet. By the end of July 2025, the California Department of Public Health reported 6,761 cases — putting the state on track to surpass the 2024 record of 12,595. For a disease that many outside the American Southwest still know little about, the trend is both alarming and deeply unsettling.
Valley Fever, also called coccidioidomycosis or “cocci,” is caused by a fungus that lives in dry soil. When the ground is disturbed, microscopic spores are released into the air and inhaled into the lungs. For some people, the infection is mild or goes unnoticed. For others, it causes weeks of fever, fatigue, chest pain, and coughing — symptoms often mistaken for pneumonia or even COVID-19. And in the most severe cases, the fungus spreads beyond the lungs to the skin, bones, or brain, leaving patients with life-threatening complications.
Climate change is making the problem worse
The steady rise in Valley Fever cases isn’t random. Scientists have long warned that climate change is creating ideal conditions for the fungus to spread. Hotter temperatures, longer droughts, and stronger dust storms mean more spores in the air — and more opportunities for people to breathe them in. California’s expanding population and relentless construction projects only add fuel to the fire, stirring up contaminated soil at a faster pace.
The truth is, Valley Fever is no longer a “regional problem.” As climate change intensifies, the fungus could spread beyond the traditional hot spots of California, Arizona, and New Mexico. Yet public awareness, funding, and preparedness remain woefully inadequate.
A health system unprepared for the surge
One of the most troubling aspects of Valley Fever is how easily it slips through the cracks of the U.S. healthcare system. Because its symptoms mimic other respiratory illnesses, it is frequently misdiagnosed or dismissed altogether. According to the CDC, this delay in proper diagnosis can mean weeks of unnecessary suffering and, in some cases, permanent damage.
Even when identified, treatment options are far from straightforward. While mild cases may resolve without intervention, severe infections require costly antifungal medications and, sometimes, lengthy hospital stays. Vulnerable groups — including older adults, pregnant women, people with diabetes, and workers exposed to dust — bear the brunt of the risk.
Why the warnings are not enough
Public health officials issue warnings each year, but they are often drowned out by bigger headlines. The lack of nationwide awareness means Valley Fever doesn’t get the same urgency as other diseases, even though its case numbers are skyrocketing. This complacency could prove disastrous.
If California is already breaking records year after year, what happens in a decade when the climate is hotter, drier, and dustier? What happens when spores travel farther, affecting states unprepared to deal with the outbreak?
The uncomfortable truth about Valley Fever
The latest figures should serve as a wake-up call. Valley Fever isn’t a rare anomaly — it’s a growing public health crisis, driven by climate change, urban expansion, and systemic neglect. Yet, the response remains reactionary rather than preventative. Until there’s a serious commitment to public awareness, early diagnosis, and environmental management, California will continue to treat Valley Fever as an annual inconvenience instead of the mounting threat it truly is.
In other words, Valley Fever is no longer just a disease of the soil. It’s becoming a symbol of how unprepared we are for the health consequences of a changing climate — and how much worse things could get if we continue to look the other way.