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Hymenolepis nana has been reported so often in the United States that it is now regarded as one of the commonest tapeworms infesting man. It has not, as far as we have been able to ascertain, been reported before from Porto Rico. The cases here presented should therefore be of some interest as further indicating the cosmopolitan distribution of this parasite.
In examining the forty-seven inmates of the boys orphan home in Hatillo for hookworms, the eggs of Hymenolepis nana were discovered in the stools of three of the boys. This home is managed entirely by local people, and admits boys from 6 to 12 years of age. One of the boys had been in the home for three years, the other two for two years. None of the boys or the director have ever been off the island. Their only contact with outside people is in the local schools.
Hill RB, Sanchez A. THE PRESENCE OF HYMENOLEPIS NANA IN PORTO RICO. JAMA. 1924;83(10):766. doi:10.1001/jama.1924.26610100002012a
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