The manifestations of aspergillosis vary significantly based on the host's immune response and pulmonary health:

Aspergillosis is a spectrum of diseases caused by the ubiquitous environmental mold Aspergillus , most commonly Aspergillus fumigatus . While healthy individuals inhale hundreds of these spores daily without harm, the fungus can cause severe illness in people with weakened immune systems or underlying lung conditions.

Pulmonary aspergillosis: a clinical review - ERS Publications