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This letter was stimulated by the article by Tsang et al. on a coagulation Factor XIIa inhibitor from adult Schistosoma mansoni (Am. J. Trop. Med. Hyg., 26: 243247, 1977). Since there is a limited literature on defining anticoagulants in helminthic infections, I felt it important to bring to the readers' attention a paper by G. G. Spellman and H. L. Nossel (Am. J. Physiol., 220: 922927, 1971). They demonstrated that an extract from dog hookworm inhibited activated Factor X and platelet aggregation.
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