Infection does not always lead to detectible disease and is not often fatal. In about 60 percent of cases, infection is so mild that individuals are unaware of being infected. In the 40 percent of those who develop problems show symptoms seven to 28 days after inhaling spores. Most recover fully, although it can sometimes take months. Occasionally the disease develops into a life-threatening form.
Diagnosis is accomplished using specific lab tests.
Arizona Board of Regents.