If contract aspergillus, am i guaranteed to get sick?

Immunecompromise: Usually the immune compromised can get sick form contract aspergilosis.

No: Aspergillus is a common fungus and the vast majority of individuals have no reaction or infection to aspergillus. Allergies to aspergillus mold are fairly common triggering allergic rhinitis and asthma. Some individuals become sensitized and have more problems with it like those with cystic fibrosis or abpa. People with immune suppression can become infected and it can be very serious.