Treating Ringworm in Cats Safely

What Is Ringworm?

Despite its name, ringworm is a fungal infection, not a parasite. Microsporum canis causes 90% of cat ringworm cases. It is highly contagious to other pets and humans.

Signs and Symptoms

Circular patches of hair loss, scaly or crusty skin, broken hairs, and sometimes itching. Kittens and immunocompromised cats are most susceptible.

Diagnosis

Wood lamp examination causes infected hairs to glow green in about 50% of cases. Fungal culture (takes 1-3 weeks) is the definitive diagnostic test.

Treatment

Topical antifungal shampoos (miconazole + chlorhexidine) twice weekly plus oral antifungals (itraconazole) for 6-8 weeks. All pets in the household should be treated.

Environmental Decontamination

Fungal spores survive for 18 months in the environment. Vacuum daily, wash bedding in hot water, and disinfect surfaces with diluted bleach (1:10 ratio).