Infection in Humans
The accidental infection of humans by the cercariae parasite occurs when the mature cercariae are released by the snail and actively search for a new host, which can be a waterfowl or mammal. If a person happens to be wading in the water during this stage of the parasite’s life cycle, they become an appealing target for these indiscriminate parasites, who will then penetrate and embed themselves in the individual’s skin.
Symptoms of Cercarial Dermatitis
When humans become hosts for cercariae, the penetration of exposed skin typically leads to immediate irritation and itchiness as a result of the body’s immune response. In some cases, the initial itchiness may temporarily subside, only to resurface within the next 24 hours, accompanied by the appearance of a rash. Cercarial dermatitis manifests as raised red welts on the skin, with the intensity of symptoms being directly influenced by the duration of time spent in the water.