Companion Animals

Cat Ringworm in Multi-Cat Environments

Ringworm (Microsporum canis) spreads rapidly in multi-cat households and catteries, causing persistent welfare problems requiring thorough treatment and environmental decontamination.

Key Facts

Ringworm is caused by a fungal dermatophyte and is highly contagious to other cats, dogs and humans
Circular hairless lesions on head, ears and legs are typical signs
Cats can carry and spread ringworm without showing obvious symptoms
Treatment requires antifungal medication and intensive environmental cleaning for 8+ weeks
Woods lamp examination glows green for M. canis but misses 30-40% of infections

Welfare Considerations

Ringworm causes significant discomfort and persistent welfare challenges in multi-cat environments. Environmental decontamination alongside medication is essential to achieve clearance.

What You Can Do

Isolate any cat showing skin lesions from others while diagnosis is pending
Follow a vet-prescribed environmental decontamination protocol alongside medical treatment
Test all in-contact cats even if asymptomatic when ringworm is confirmed in one individual