Scrapings from a patient's rash reveal cercariae. The disease is most likely

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Cercariae are the larval form of flatworms that cause swimmer's itch. The cercariae come into contact with human skin while swimming in contaminated water, causing an itchy rash. Lyme disease is caused by a bacteria transmitted by ticks, Chagas' disease is caused by a parasitic protozoan, relapsing fever is caused by a bacteria transmitted by lice or ticks, and Rocky Mountain spotted fever is caused by a bacteria transmitted by ticks.

Scrapings from a Patient's Rash Reveal Cercariae