Aspergillosis is a fungal condition, caused by Aspergillus fumigatus.

Illness occurs in cases of allergic reaction, immune suppression, or in previously damaged lung.

Principally three clinical syndromes are seen:

• an aspergilloma
• allergic bronchopulmonary aspergillosis
• invasive aspergillosis

Aspergillus species are also associated with causing:

• asthma
• otomycosis
• extrinsic allergic alveolitis
• cerebral infarctions or brain abscesses, endocarditis, and problems in the ears and sinuses.

Most disease is due to Aspergillus fumigatus but there are many other members of the genus - e.g. A. clavatus, A. flavus, A. niger - which may result in these conditions.