This type of reaction from indoor mold is fairly rare, occurring
primarily in those individuals who are susceptible. Aspergillus types
of mold have been known to be pathogenic (a disease producing
microorganism) For instance, Aspergillus fumigatus (A. fumigatus)
is a fairly weak pathogen thought to cause infections in vulnerable
individuals. A. fumigatus is also fairly commonly implicated in ABPA
and allergic fungal sinusitis.

Other fungi that cause infection include Coccidioides, Histoplasma,
and Blastomyces. However, these fungi are rarely found indoors,
growing instead in soil and dirt. Human contact is usually
due to contact with animals.