The source of most dermatophyte infections
is other animals. M. canis
infections in both cats and dogs usually originate from contact with an infected
cat, whereas many T. mentagrophytes
infections are thought to originate from
rodents. M. gypseum,
however, is a soil organism.
The arthrospores of dermatophytes are, however,
very resistant, and can survive in the environment, on furniture and equipment for
several years, providing a long-term source of infection.
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