Valley Fever: Why The Fungal Disease Is Spreading Into Northern California
The effects of climate change in California, from harsher heat waves to more volatile rainstorms, are well established. Lesser known is what those crises can help fuel: the northern migration of infectious diseases. One, in particular, is already on the move. Valley fever, a respiratory disease spread by fungal spores that grow in soil, has long been concentrated mostly in the Arizona desert and California’s lower San Joaquin Valley. But a growing body of research suggests the disease is gaining a foothold farther north, driven by warming temperatures and extreme swings in rainfall and drought tied to climate change. Annual cases of valley fever in California rose from fewer than 1,500 in 2001 to a high of more than 9,000 in 2019, according to the state’s public health department. In 2021, the last year with available data, the state recorded more than 8,000 cases. “Valley fever is starting to expand into areas of California where it used to be less common,” said Gail Sondermeyer Cooksey, an epidemiologist at the California Department of Public Health Infectious Diseases Branch. “It’s an indicator of climate change that impacts human health.”
San Francisco Chronicle
|