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{| cellpadding="10" cellspacing="0" border="1"
| Also known as:
| '''Barber's pole worm
|-
| The most important veterinary species
|'''''contortus'''''
|-
|}
Haemonchus contortus is a nematode parasite from the family '''Trichostrongyloidea.''' It is found worldwide, and is an extremely important parasite of sheep and goats, particularly in tropical/ subtropical regions.
Within the UK, it is found most commonly in the South, where the climate tends to be a little warmer and drier. Some have shown complete resistance to current anthelemintics which is posing a real problem, making sheep and goat farming extremely difficult in some areas of the country.
*''Haemonchus contortus'' (abomasum) - sheep
*''Haemonchus contortus'' (abomasum) - sheep
**2cm long,'''barber's pole''' appearance when fresh
**2cm long,'''barber's pole''' appearance when fresh