Volume 26, Issue 5
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645


This letter was stimulated by the article by Tsang et al. on a coagulation Factor XIIa inhibitor from adult ( 243–247, 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 ( 922–927, 1971). They demonstrated that an extract from dog hookworm inhibited activated Factor X and platelet aggregation.


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