Examination of published records shows that there have been eight unquestioned cases of native infestation with the fish tapeworm (Diphyllobothrium latum). These cases are those of Nickerson,1 a boy aged 2 years, and a woman, Minnesota; of Warthin2 and Arminen, a girl, aged 5 years, Michigan; of Riley,3 a boy, aged 8 years, and an Indian child, Minnesota; of Calvin,4 a girl, aged 7 years, and a boy, aged 3 years, Illinois, and of Wallace and Grant,5 a woman, aged 25 years, Indiana.
A few cases of possible native infestation have also been recorded.6 Owing to the fact that the patients in these cases were born abroad, there is some doubt as to their being true native cases even though the patients entered the United States as young infants. The extreme youth of patients in some of the undoubted native cases shows that infestation
LYON MW. NATIVE CASE OF INFESTATION BY THE FISH TAPEWORM, DIPHYLLOBOTHRIUM LATUM. JAMA. 1926;86(4):264–265. doi:10.1001/jama.1926.02670300026008
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