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In vitro exsheathment requirements for two strains of Helgmosomoides polygyrus.
Intestinal nematodes of the family Heligmosomidae have been the subject of investigation for many years. Perhaps, the best studied species in the family has been Heligmosomoides polygyrus (Dujardin, 1845) (Nematospiroides dubius Baylis, 1926). Although much has been learned about Heligmosomoides polygyrus since its original description, some biological problems concerning it remain to be solved. The most interest- ing and important of these are in the areas of its taxonomy and physiology.