Haemonchosis: dealing with the increasing threat of the barber's pole worm

James Crilly, Michael Evans, Katrin Tähepõld, Neil Sargison

Research output: Contribution to journalArticlepeer-review


Haemonchus contortus is a trichostrongyle nematode parasite of sheep and goats, and worldwide is considered
to be the most important parasite of these species. It has a similar lifecycle to other parasitic trichostrongyle
gastrointestinal nematodes, but it has a markedly higher fecundity, a preference for higher temperatures
and a short pasture development time, which makes it epidemiologically different. Similarly, because of its
blood-feeding habit the disease produced is distinct from parasitic gastroenteritis. This article summarises the
differences in biology and control of H. contortus to other gastrointestinal nematodes of sheep, and covers
specific control measures such as the use of FAMACHA© scoring, use of closantel and nitroxynil, the H. contortus
vaccine, the effect of copper oxide wire particles, and the potential for breeding haemonchosis-resistant sheep and other future developments in H. contortus control.
Original languageEnglish
JournalUK Vet: Livestock
Issue number5
Publication statusPublished - 11 Sep 2020


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