Characteristics: Considered a type I and type III allergen. Rarely pathogenic. Not considered toxigenic.

Description: It is often found in organic matter, dung, and soil. It is disseminated as a wet spore by rain splash or as a dry spore by the wind. For indoor growth this fungus is commonly found on leftover food, soft fruits, and juices. As an allergen, it has been known to cause type I symptoms like hay fever and asthma as well as type III symptoms like hypersensitivity pneumonitis. As a pathogen, it has rarely been known to cause infections in severely debilitated patients. As a toxigenic agent, old cultures have been found to produce a substance which inhibits further growth and promotes autolysis of the culture. Mucor produces proteolytic enzymes used in cheese production.

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