ABSTRACT
Haemonchus contortus is one of the 12 known Haemonchus species, as recently reviewed by Hoberg et al. [1]. Three species in the genus Haemonchus (i.e., H. contortus, H. placei, and H. similis) have global distributions and are among the most economically important helminths in sheep, goats, and cattle. The fourth species infecting domesticated ungulates, Haemonchus longistipes, is a common parasite of camels (i.e., Camelidae), and its expanding geographic distribution is resulting from the anthropogenic spread of its hosts. Distributions among the remaining eight Haemonchus species are much more limited, being found primarily in wild Antilopinae (e.g., true antelopes) and Bovinae (e.g., water buffalo and yaks) ungulates in sub-Saharan Africa [1].
