Alternaria sp.
Commonly found in outdoor air. One of the most important of the fungal allergen sources. Type I (hay fever & asthma) and Type III (hypersensitivity pneumonitis) allergens. Occasionally causes phaeohyphomycosis most commonly in subcutaneous tissue. Majority of infections reported from persons with underlying disease or in those taking immunosuppressive drugs.
Although Alternaria is a notable source of fungal allergy, pathogenic infections are reported infrequently.