Valley fever feeds on heat.
And as the average temperature ticks up with each passing decade, experts are concerned that the fungus’ footprint and impact are expanding, as evidenced by a rise in cases in areas far outside the hot spots of the Central Valley of California.
In the soil, the cocci fungus lives on dead organic matter. Less rainfall and higher temperatures reduce overall vegetation, diminishing soil competition for the hardy fungus, scientists say. Cocci spores survive—even thrive—when the environment is drier and hotter since other competitors die off.