These 11 Haemonchus contortus adult females were taken from one sheep infected with a single strain of this worm species.
Haemonchus contortus egg
Scientific classification
Domain:
Eukaryota
Kingdom:
Animalia
Phylum:
Nematoda
Class:
Chromadorea
Order:
Rhabditida
Family:
Trichostrongylidae
Genus:
Haemonchus
Species:
H. contortus
Binomial name
Haemonchus contortus
(Rudolphi, 1803) Cobb, 1898
Synonyms
Haemonchus placei Place, 1893[1] (closely related species)
Haemonchus contortus, also known as the barber's pole worm, is a very common parasite and one of the most pathogenic nematodes of ruminants. Adult worms attach to abomasal mucosa and feed on the blood. This parasite is responsible for anemia, oedema, and death of infected sheep and goats, mainly during summer in warm, humid climates.[2]
Females may lay over 10,000 eggs a day,[3] which pass from the host animal in the faeces. After hatching from their eggs, H. contortus larvae molt several times, resulting in an L3 form that is infectious for the animals. The host ingests these larvae when grazing. The L4 larvae, formed after another molt, and adult worms suck blood in the abomasum of the animal, potentially giving rise to anaemia and oedema, which eventually can lead to death.[4]
The infection, called haemonchosis, causes large economic losses for farmers around the world, especially for those living in warmer climates. Anthelminthics are used to prevent and treat these, and other, worm infections, but resistance of the parasites against these chemicals is growing. Some breeds, such as the West African Dwarf goat and N'Dama cattle, are more resistant than other breeds to H. contortus (haemonchotolerance).[5]
^Burke, Joan, Research Animal Scientist. Management of Barber pole Worm in Sheep and Goats in the Southern U.S. USDA, ARS, Dale Bumpers Small Farms Research Center, Booneville, AR. Archived 2009-03-05 at the Wayback Machine>
^"Barber's pole worm (Haemonchus contortus) at Australian Wool Innovation Limited". Archived from the original on 2012-04-30. Retrieved 2010-11-04.
^"Haemonchus, Ostertagia, and Trichostrongylus spp". The Merck Veterinary Manual. 2006. Retrieved 2007-07-01.
^Chiejina, Samuel N; Behnke, Jerzy M; Fakae, Barineme B (2015). "Haemonchotolerance in West African Dwarf goats: Contribution to sustainable, anthelmintics-free helminth control in traditionally managed Nigerian dwarf goats". Parasite. 22: 7. doi:10.1051/parasite/2015006. PMC 4321401. PMID 25744655.
and 26 Related for: Haemonchus contortus information
Haemonchuscontortus, also known as the barber's pole worm, is a very common parasite and one of the most pathogenic nematodes of ruminants. Adult worms...
glutamate-gated chloride channel α-subunit gene of Haemonchuscontortus and Cooperia oncophora, as well as in the H. contortus genes coding for p-glycoprotein and the...
method for controlling the level of parasitic barber's pole worm (Haemonchuscontortus, also known as twisted wireworm) among domesticated small ruminant...
Robin N. (2008-03-25). "P-glycoprotein selection in strains of Haemonchuscontortus resistant to benzimidazoles". Veterinary Parasitology. 152 (1–2):...
survive temperatures below 0 °C for weeks to months. The nematode Haemonchuscontortus can survive 44 weeks frozen at liquid nitrogen temperatures. Other...
diet containing common sainfoin is able to reduce nematode (e.g. Haemonchuscontortus) parasitism in ruminant’s guts. Due to the high levels of condensed...
(they resist infections with the gastrointestinal parasite nematode Haemonchuscontortus more effectively than other breeds of domestic goat). West African...
exotic ranch in Texas, an addax was found host to the nematodes Haemonchuscontortus and Longistrongylus curvispiculum in its abomasum, of which the former...
of essential oil of Ocimum gratissimum Linn. and eugenol against Haemonchuscontortus". Veterinary Parasitology. 109 (1–2): 59–63. doi:10.1016/S0304-4017(02)00253-4...
advanced in Australia and New Zealand where the dominant nematodes are Haemonchuscontortus or a mixture of T. circumcincta and Trichostrongylus colubriformis...
their ability to resist foot rot (Fusobacterium) and the dreaded Haemonchuscontortus which are both more common in warmer climates. Dohner, Janet Vorwald...
Trodax. Nitroxynil is also used against strains of the red gum worm (Haemonchuscontortus) that have become resistant to benzimidazoles.[citation needed] Nitroxinil...
three tanniferous forage plants to lambs artificially infected with Haemonchuscontortus and Cooperia curticei" (PDF). Vet. Parasitol. 146 (1–2): 123–34....
inhabiting the hearts, arteries, and lungs of dogs and some cats. Haemonchuscontortus is one of the most abundant infectious agents in sheep around the...
to temperatures down to -273 °C is the tardigrade. The larvae of Haemonchuscontortus, a nematode, can survive 44 weeks frozen at -196 °C. For the wood...
Maasai sheep are renowned for their resistance to parasite like Haemonchuscontortus. In Africa, endoparasites in particular can cause large livestock...
1961 and horses in 1962, resistance to this drug was first found in Haemonchuscontortus in 1964, and then in the two other major small ruminant nematode...
action on eggs and larvae of the sheep gastrointestinal nematode Haemonchuscontortus. Anethole also has nematicidal activity against the plant nematode...
the infection caused by Ostertagia ostertagi and Haemonchuscontortus. O. ostertagi and H. contortus cause more severe signs of infection than C. oncophora...
fungus, Duddingtonia flagrans to sheep for biological control of Haemonchuscontortus. Area specific mineral-mixture pellets for augmenting reproduction...
asafetida, closantel, albendazole, oxfendazole, and ivermectin against Haemonchuscontortus in goats and sheep". Tropical Animal Health and Production. 54 (2):...
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