Cat Ringworm: Systemic Treatment in Multi-cat Environments

Ringworm in cats is highly contagious and can affect humans. Systemic treatment and environmental decontamination are needed for complete resolution.

Key Facts

Feline ringworm is caused by the dermatophyte Microsporum canis in most cases
It is a zoonosis — humans in contact with infected cats can develop skin lesions
Kittens and immunocompromised cats are most severely affected
Treatment combines oral antifungals with topical therapy and environmental control
Resolution typically takes 8-16 weeks with consistent treatment

Welfare Considerations

Ringworm causes circular areas of hair loss, scaling and sometimes pruritus. In shelter environments it spreads rapidly and is a common cause of extended isolation for affected animals. Systemic itraconazole or terbinafine combined with twice-weekly lime sulphur dips provides the most evidence-based cure. Environmental decontamination with appropriate antifungal disinfectants is essential to break the cycle. Owner and staff education about zoonotic risk and protective measures is a key welfare and public health consideration.

What You Can Do

Seek veterinary diagnosis with fungal culture before starting antifungal treatment
Complete the full course of oral antifungal treatment even after lesions resolve
Use gloves and wash hands after handling affected cats
Hoover and disinfect home surfaces including soft furnishings regularly
Isolate affected cats from other pets and vulnerable household members