We measured the effect on snail populations, as well as on the presence/abundance of swimmer's itch-causing parasites using qPCR. In this study, we evaluated the impact of targeted CuSO 4 application to a specific recreational swimming area in a lake in Michigan. Previous research has found that the larval stage of the parasites responsible for swimmer's itch are released from infected snails and are concentrated by onshore and alongshore winds, and thus, may not be affected by such focused applications. It is unclear whether targeted application of chemical molluscicides like CuSO 4 is effective for controlling swimmer's itch. CuSO 4 is still sometimes applied specifically to areas of lakes where swimmer's itch severity is high. Normally, these small organisms migrate back into ducks, but if a swimmer gets in their path, they. These parasites, which are not visible to the naked eye, travel from the waterfowl droppings to host snails, which then release the parasite into the water. Statewide Beach Advisories and Closures Swimmers Itch Information. Swimmer's itch has historically been controlled by applying copper sulfate (CuSO 4) to lakes as a way to eliminate snails that serve as the intermediate hosts for swimmer's itch-causing parasites. Swimmer’s itch is caused by a parasite carried in the digestive tracts of waterfowl. and next day results are available on the Michigan Department of Environment.
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