SANTA MONICA, Calif. — California and Arizona make up more than 95% of all U.S. cases of valley fever — an infection caused by a fungus that lives in soil in the Southwest — largely because they share arid climates and have an abundance of outdoor workers.

New research finds that as climate change alters American landscapes in the coming decades, valley fever has the potential to spread far beyond the Southwest. Researchers at the University of California, Irvine predict the range of what’s colloquially known as “San Joaquin Valley fever” will more than double over the next 75 years, spreading to the Midwest and Canada.

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