Ringworm in Cats

Dr. Lera talks about ringworm in cats with Pearl, a seven-year-old Persian cat.

Ringworm is the common name given to a fungal infection of the superficial layers of the skin, hair, and nails. Ringworm infections can occur in humans and in all domesticated species of animals. The name comes from the classical appearance of the round, red, raised 'ring' marking the boundary of inflammation in people infected with the disease. The common name of ringworm is somewhat misleading, in that it is not an infection caused by a worm, and the infected areas are not always ring-shaped. The organisms that cause ringworm infections belong to a specialized group of fungi known as dermatophytes, so the medical name for this disease is dermatophytosis.

Some species of dermatophytes are species-specific, meaning that they will only infect one species, whereas others can be spread between different species of animals or from animals to humans. In cats, one species of dermatophyte, called Microsporum canis, is responsible for almost all ringworm infections. This species is also infectious to dogs and humans. Occasionally ringworm infections in cats may be caused by species such as Trichophyton mentagrophytes. This species is also zoonotic, meaning that it can also infect humans. (source: vcahospitals.com)

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