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This lecture presents in a brief form and with a minimum of technical terms the main outlines of our present knowledge relating to the introduction of the fish tapeworm into the United States and its spread. Necessarily a considerable proportion of the facts presented have been gleaned from a diligent search of the literature. These facts have been carefully analyzed and interpreted, and herein lies one of the principal values of this pamphlet. In addition to the review of the literature, Professor Ward has summarized the contributions made by himself and his co-workers. In the section on introduction into North America, page 9, attention is called to Weinland's long ignored report of the finding of this tapeworm in 1858, some twenty years before Leidy's first published report. Ward justly gives the credit for the first correct estimate of the situation with respect to this parasite in this country to Warthin,
The Introduction and Spread of the Fish Tapeworm (Diphyllobotherium Latum) in the United States.. JAMA. 1931;97(3):201-202. doi:10.1001/jama.1931.02730030051033