Although humans are not suitable hosts, the microscopic larvae burrow into the swimmer's skin, and may cause an allergic reaction and rash. This larval form then swims about searching for a suitable host (bird, muskrat) to continue the lifecycle. Infected snails release a different type of microscopic larvae (or cercariae, hence the name cercarial dermatitis) into the water. If the larvae find one of these snails, they infect the snail, multiply and undergo further development. These larvae swim in the water in search of a certain species of aquatic snail. If the eggs land in or are washed into the water, the eggs hatch, releasing small, free-swimming microscopic larvae. The parasites produce eggs that are passed in the feces of infected birds or mammals. The adult parasite lives in the blood of infected animals such as ducks, geese, gulls, swans, and certain mammals such as muskrats and raccoons. Transmission How does water become infested with the parasite? If itching is severe, your health care provider may suggest prescription-strength lotions or creams to lessen your symptoms. Scratching may cause the rash to become infected.
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