Ringworm is contagious from about 1 to 2 weeks before visible signs appear and remains contagious as long as the fungal spores are present on the skin. This period can extend for several weeks to months, even with treatment, until all fungal spores are eliminated. Typically, with proper antifungal treatment, ringworm is likely to stop being contagious approximately 48 hours after starting treatment, especially if the affected areas are covered. Without treatment, the infection can remain contagious for much longer, until it resolves naturally, which may take months. Fungal spores can also persist in the environment (on clothing, bedding, and surfaces) for up to 12 to 20 months, posing a continued risk of transmission if preventive measures are not followed. For pets, the contagious period may last about three weeks from the start of aggressive treatment. In summary, ringworm is contagious:
- About 1-2 weeks before symptoms appear,
- Throughout the entire period the lesions are visible,
- Until approximately 48 hours after starting effective treatment,
- And as long as fungal spores persist on the skin or environment, which may be weeks to months.
Covering lesions and maintaining hygiene can significantly reduce the spread during the contagious period.
