Cercarial dermatitis occurs on the exposed skin outside of close-fitting garments. The areas of skin affected by seabather’s eruption is generally under the garments worn by bathers and swimmers where the organisms are trapped after the person leaves the water. These schistosomes all use different snail intermediate hosts, commonly those from the families Nassariidae, Lymnaeidae, and Physidae.Ĭercarial dermatitis should not be confused with seabather’s eruption, which is caused by the larval stage of cnidarians (e.g., jellyfish). ![]() ![]() states, but much of the research over the years has focused on Michigan and the Midwest because Hope College emeritus biology professor Harvey. ( =Orientobilharzia) turkestanicum) occur occasionally. Swimmer’s itch has been reported in 30 U.S. Itching may continue for a week gradually decreasing in. The spots continue to increase in size for about 24 hours and cause intense itching. Soon, often within 30 minutes, a small red spot appears at each site of entry. Cases involving mammalian schistosomes Heterobilharzia americana, Bivitellobiharzia spp., Schistosomatium spp., and some aberrant zoonotic Schistosoma spp. At first, an affected person may feel a tingling, burning, or itching of skin that was directly exposed to the lake water. ), Bilharziella polonica, and Gigantobilharzia huronensis. Other avian schistosomes that cause cercarial dermatitis include Ornithobilharzia spp., Austrobilharzia spp. ![]() Several genera/species are known to cause cercarial dermatitis the most commonly implicated genus globally is the waterfowl schistosome Trichobilharzia spp. Skin penetration by these zoonotic cercariae causes dermatitis, but the cercariae do not mature into adults in the human body. Swimmer’s itch (cercarial dermatitis) is a skin irritation caused by a larval form of certain flatworms from the family Schistosomatidae. The beach was great, but watch out for swimmers itch. These cercariae seem to have a chemotrophic reaction to secretions from the skin and are not as host-specific as other types of human-infecting schistosomes. Clean (but could use some updated linen), beds were comfortable, and plenty of fans (no AC). Cercarial dermatitis (“swimmer’s itch”, “clam-digger’s itch”, “duck itch”) is caused by the cercariae of certain species of schistosomes whose normal hosts are birds and mammals other than humans.
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