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The Incubation Period of Trichinosis^*

The incubation period of 156 cases of trichinosis compiled from the recent literature and from a large outbreak in Rochester, New York, was 22 days or less in 98 per cent of the cases. The shortest period reported was two days. The great variability in the duration of the incubation period and the fact that occasionally it was three weeks or longer, emphasize the lack of close correlation between the life cycle of the Trichinella parasite and the clinical course of the disease. These observations contribute evidence to the view that the symptoms of trichinosis result mainly from an accumulated toxemia rather than directly from the activities of the parasite during migration in the body.

Received February 7, 1942.
^* Read at the Thirty-Seventh Annual Meeting of the American Society of Tropical Medicine, November 12, 1941, at St. Louis, Mo.