Among adults hospitalized for community-acquired pneumonia at an Arizona hospital, Valley fever was the most commonly identified cause among those tested. Mayo Clinic Phoenix researchers reviewed records for 1,141 patients admitted over a twelve-month period and found 76 percent were tested for Coccidioides, and 10 percent of those tested were positive.
The corollary is the part worth sitting with. Roughly a quarter of pneumonia patients in a region where the fungus is endemic were never tested for it.