Ringworm is highly contagious. It spreads through direct skin-to-skin contact, through shared objects like towels and clothing, and even from pets and soil. The fungus can pass between people, from animals to people, and from contaminated surfaces, making it one of the more easily transmitted skin infections.
How Ringworm Spreads
Despite its name, ringworm isn’t caused by a worm. It’s a fungal infection of the skin, and the fungi responsible have several routes into your body.
Person to person: Direct skin contact is the most straightforward path. This is especially common among wrestlers and other contact-sport athletes, where the infection is so frequent it has its own name: tinea corporis gladiatorum. Children who have ringworm on the scalp can also spread it to others through casual head-to-head contact.
Animals to people: Cats and dogs are common carriers. Children are especially likely to pick up ringworm from pets because of how much hands-on time they spend with animals. If your pet develops a patchy rash or areas of hair loss, keep your distance and bring them to a vet before the infection jumps to you.
Shared objects: Towels, clothing, combs, bedding, and sports equipment can all harbor the fungus. This is why ringworm circulates easily through households, locker rooms, and daycares.
Soil: Less commonly, you can contract ringworm directly from contaminated ground. Soil-dwelling fungi thrive in dirt rich in organic matter, and infections from this route are more common among farmers and gardeners. Even children playing in sand can pick it up. Soil-based ringworm is more frequently reported in South America and Asia than in North America or Europe, and it tends to occur in rural areas.
How Long the Fungus Survives on Surfaces
One reason ringworm spreads so easily is that the fungus is remarkably durable outside the body. In lab testing, fungal spores on fabric survived freezing temperatures for at least a week. They also survived standard heat drying in both home and laundromat machines, and even direct heat exposure at 60°C (140°F) for up to 90 minutes.
Washing contaminated fabric in hot water does work, but only at high enough temperatures and long enough cycles. Laundry washed at 60°C or 90°C (140°F to 194°F) for 100 minutes or more killed the fungus completely. However, washing at just 40°C (104°F), a common warm-water setting, left the spores fully viable. If you’re dealing with ringworm in your household, wash bedding, towels, and clothing on the hottest setting your machine offers, and run a longer cycle.
How Long You’re Contagious
Once you start applying an antifungal treatment, the contagious window closes quickly. After 48 hours of treatment, ringworm is generally no longer spreadable to others. Wrestlers typically need to wait at least 3 days of treatment before returning to competition, given the intense skin contact involved.
Before treatment begins, though, you’re contagious for as long as the rash is present. You can also spread the fungus from one part of your body to another by touching or scratching an infected area and then touching elsewhere. Washing your hands after applying medication or touching the rash helps prevent this kind of self-spread.
Keeping It From Spreading at Home
Most ringworm prevention comes down to breaking the chain of contact. Don’t share towels, clothing, combs, or hats with anyone in the household, even if no one appears infected yet. Wash bedding and towels frequently in the hottest water available. If someone in your home has an active infection, avoid direct skin contact with the affected area until they’ve been on treatment for at least 48 hours.
For pets, watch for circular patches of hair loss, scaly skin, or crusty areas, particularly around the ears and face. These don’t always look dramatic, and some animals carry the fungus without showing obvious symptoms. A vet can confirm the diagnosis and start treatment, which protects both the animal and everyone in the household.
If you garden or work with soil regularly, wearing gloves reduces your exposure to soil-dwelling fungi. This is a lower-risk route than person-to-person or animal-to-person contact, but it’s worth knowing about if you develop an unexplained rash on your hands or arms after working outdoors.