FIFTY-THREE picnickers, affected in this outbreak, were members of a small community, and available for early examination, and follow-up. The natural history of the condition, which was first described by Cort 1 from Michigan, is briefly as follows: Cercariae pass from snail to fish; the fish is eaten by a bird and the organism reenters the lakewater from the birds' droppings. Cercariae from the snail may infest man instead of fish and give rise to a skin eruption; man is an unsatisfactory host, and the cercaria dies after penetrating the human epidermis. Eighty-eight persons bathed in Lake Nipissing, Ontario on June 20, 1953; 63 were under the age of 10 years. SKIN MANIFESTATIONS Early Manifestations .—Forty-five persons started itching at times ranging between 10 minutes and three hours after leaving the water. Seven persons stated that they started itching while in the water and one person did not notice itching

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