![]() 6 Mold sensitization rates vary according to different studies, but allergy to Alternaria alternata seems to affect roughly 5 percent of people and is strongly associated with allergic rhinitis (aka hay fever) and asthma. 4Īlternaria thrives at temps of 20 to 25 C (68 to 77 F), but it can survive temperatures between 1 and 35 C (roughly 34 and 95 F). That is, if there are considerable spores in the outdoor air, indoor levels may be high as well. ![]() ![]() 4,5 That said, indoor Alternaria alternata concentrations are typically impacted by the current amount of outdoor concentrations. 4 However, the species can also be found indoors, where it prefers humid locations such as bathrooms and often produces large brown spores that are a well-known cause of allergy and asthma. 3 Alternaria alternata is mainly an outdoor fungus that typically grows on vegetation. 2 Those allergic to this mold may experience symptoms after inhaling its spores. 1,2 Therefore, in temperate climates, Alternaria alternata spore counts are usually highest in the summer. The most prevalent mold in dry, warm climates, Alternaria alternata has air spores that peak in the afternoon and typically disseminate in warm, dry air.
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