If you want to know your risk of getting Valley Fever, looking at where the wild animals live is actually more accurate than checking the soil.
medRxiv · March 13, 2026 · 10.64898/2026.03.10.26348058
Why it matters
Valley Fever is traditionally viewed as a fungus people catch simply by breathing in desert dust. This study reveals that mammalian wildlife like rodents are actually the primary drivers of where the disease is found, shifting the focus from purely environmental factors to a complex interaction between fungi and animal ecology.
From the abstract
Global environmental change is reshaping human exposure to zoonotic and environmentally acquired pathogens, yet predicting disease risk remains challenging. High-resolution risk maps typically rely on human case data and environmental correlates, often overlooking ecological processes such as wildlife reservoirs. We evaluated whether mammalian reservoir distributions improve prediction of coccidioidomycosis (Valley fever), an emerging, environmentally-acquired fungal disease with a poorly charac