
If you can’t (or even after you do), rub down vigorously all over with a rough towel.įor more information, visit the CDC Swimmer’s Itch frequently-asked-questions page.

The rash shows up any time from a couple of hours to two days after exposure. The flatworm larvae cause an allergic reaction, but because humans aren’t a suitable host for the worms, they die without infecting you. People who get it tend to swim regularly, have sensitive skins, and wade or hang out in shallow water (especially kids), since the parasites tend to concentrate near the shoreline. and all the Canadian provinces, most of them in the northern tier of states. The cause? The larval, aquatic form of a flatworm whose life cycle involves both snails and (in most cases) birds.Ĭases have occurred in every state in the U.S.

Once you’ve had a case of raised rash that can itch for a couple of weeks (a lot like poison ivy), you won’t want to get it again. When the water gets warm enough for swimming, I know I’ll need to take preventive measures before and after my frequent midsummer swims to keep from getting a bad case of swimmer’s itch.
