Kitten Ringworm: Signs, Treatment and How to Protect Your Family

By Tailwisp Editorial TeamUpdated October 20, 20264 min read

Despite its name, ringworm has nothing to do with worms. It is a fungal infection, usually caused by Microsporum canis, that feeds on keratin in hair, skin and claws. It is among the most common skin diseases of kittens, especially those from shelters, catteries and the street.

Why kittens are at risk

Young kittens have immature immune systems, and often come from crowded settings where spores spread easily. Long-haired kittens are more likely to carry spores without signs. Stress, poor nutrition and other illness add risk. The fungus spreads by direct contact, and through contaminated bedding, brushes, carpets and furniture. Spores can survive in the home for months. See ringworm in cats.

Signs of ringworm

• Circular or irregular patches of hair loss, often on the head, ears, face, paws and tail.
• Scaly, crusty or reddish skin.
• Broken hairs and a stubbly look.
• Mild or no itching, though some kittens scratch.
• Misshapen, brittle claws.
• Some kittens look normal but carry spores.

Other conditions, such as mites, bacterial infection and allergies, cause similar patches, so testing is important.

Diagnosis

Your vet may:

• Use a Wood's lamp, a special UV light. Some strains glow apple green, but not all, and false results occur.
• Examine hairs under a microscope.
• Perform a fungal culture, brushing the coat with a sterile toothbrush and growing the sample. Results take one to three weeks.
• Run PCR tests, which give faster results.

Treatment

Treatment has three parts:

1. Oral antifungal medication, prescribed by your vet. Never give human antifungals.
2. Topical therapy, such as medicated shampoos or rinses, usually twice weekly.
3. Environmental cleaning, to reduce spores.

Treatment often lasts at least six weeks. Your vet will repeat cultures and continue until two consecutive negative results. Stopping early is the commonest cause of relapse. Clipping long coats may help in some cases, as your vet advises.

Protecting your home

• Confine the kitten to an easy-to-clean room, such as a bathroom, during treatment. See kitten safe room setup.
• Vacuum daily, and dispose of the bag. Spores live in hair and dust.
• Wash bedding and soft items in hot water, daily or often.
• Disinfect hard surfaces with diluted bleach, about one part bleach to ten parts water, or other products your vet recommends, after cleaning off hair. See cat safe cleaning products.
• Replace or deep-clean brushes and toys.
• Keep other pets separate, and ask your vet whether they should be tested or treated.

Protecting people

Ringworm can spread to humans, causing red, ring-shaped, itchy patches. Children, the elderly and people with weak immune systems are most at risk.

• Wash hands thoroughly after handling the kitten or its things.
• Wear gloves when treating, and a long-sleeved top if handling.
• Do not kiss or cuddle the kitten against bare skin until cleared.
• See a doctor if you or family members develop skin lesions, and mention the kitten.

Grooming and baths

Medicated baths should be done as your vet directs. See kitten first bath and grooming for safe bathing technique. Avoid sharing grooming tools between pets.

Shelter and foster kittens

Ringworm is a common reason for kittens to need isolation. Many shelters and rescues treat affected kittens in foster homes. If you foster, follow instructions carefully.

Prevention

• Quarantine new kittens for a few days, and watch for signs.
• Ask about ringworm history when adopting.
• Wash hands between animals.
• Keep the home clean.
• Feed good nutrition, and reduce stress.

Is it serious?

Ringworm is usually a nuisance, not a danger, in healthy kittens. But it is persistent, contagious and time consuming, so early action pays off. Kittens with other illnesses may be sicker. See kitten sneezing and eye discharge.

Patience and commitment

Treatment is a marathon. Keep records of medication, baths and cleaning. Photograph the skin weekly. Ask your vet when to retest.

Frequently asked questions

Can adult cats carry it without signs? Yes, which is why all pets in the household may need testing. Does ringworm smell or itch? Usually not much. Can an indoor kitten get it? Yes, from people, objects or other pets. Is it safe to handle the kitten? Yes with gloves and hand washing, but avoid face contact. When is it over? When your vet confirms negative cultures, usually after at least two clear tests, and the coat has regrown.

Emotional realities

Treatment is demanding, and isolating a young kitten can feel unkind. Spend short, calm sessions with it in its room, wearing gloves, and offer toys that can be washed or discarded. A kitten that is cured is not any less friendly, and many go on to make wonderful pets.

When to see a vet

See a vet if your kitten has patchy hair loss or scaly skin. Use the US vet directory to find a clinic.