Who is more susceptible to pulmonary aspergillosis?

Depends: The term pulmonary aspergillosis may refer to actual infection of the lung by aspergillus which usually occurs in patients with depressed immune system. The term can also be an "allergy" to aspergillus which is more common in patient with asthma and cystic fibrosis. A fungus ball of aspergillus is a complication of an old cavity in the lung growing a fungal ball.

Several kinds.: People with underlying emphysema with bullae can get aspergillomas. People with asthma can be allergic aspergillosis. People with immune deficiencies can get invasive and potentially fatal aspergillosis.