Is it reasonable to even suggest that trace amounts of CO2 caused a 5X spike in valley fever in 10 years?

Arizona: Climate change could increase diseases here

Valley fever: Spiked from less than 1,000 cases in 1997 to 5,000 or more cases in Arizona in 2006 and 2007. Increase causes are under study, but they're possibly linked to drought caused or aggravated by warming. Also could be caused by better reporting, construction dust and more vulnerable elderly people moving here.