In vitro action of tetramisole on hookworm, Ancylostoma duodenale.
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To induce chronic and continuous intestinal blood loss as therapy for congenital polycythemia in a 3 year old child, adult Ancylostoma duodenale were transferred directly from a dog to the patient via a nasoduodenal tube. By transferring adult worms, larval migration via the skin, blood and lungs--with possible attendant undesired side effects--was avoided. Furthermore, by eliminating larval migration with associated intimate tissue contact, immunogenicity was presumably reduced, and a known number of adult worms could be delivered directly to the final predilection site, the small intestine. An eosinophilic reaction of up to 23,000 cells/mm3 was observed, which may have adversely affected attempted superinfection. The relatively small numbers of parasites given on three separate occasions did not result in blood loss to a degree sufficient to eliminate the need for other forms of therapy.