Tony had Valley Fever one time when he was in Arizona.

It's also called Coccidioidomycosis –noun

Pathology. a disease caused by inhaling spores of Coccidioides fungi, characterized by fever, respiratory infection, and reddish bumps on the skin, common in hot, semiarid regions, esp. in southwestern U. S. and Mexico.

Now given that Tony has had the plague which weakened his lungs, if he caught Valley Fever now, it'd be a huge dramatic angst fest.