Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/22437
Title: Diagnosis, Treatment and Management of Haemonchus contortus in Small Ruminants
Contributor(s): Besier, R B (author); Kahn, Lewis  (author)orcid ; Sargison, N D (author); Van Wyk, J A (author)
Publication Date: 2016
DOI: 10.1016/bs.apar.2016.02.024
Handle Link: https://hdl.handle.net/1959.11/22437
Abstract: Haemonchus contortus is a highly pathogenic, blood-feeding nematode of small ruminants, and a significant cause of mortalities worldwide. Haemonchosis is a particularly significant threat in tropical, subtropical and warm temperate regions, where warm and moist conditions favour the free-living stages, but periodic outbreaks occur more widely during periods of transient environmental favourability. The clinical diagnosis of haemonchosis is based mostly on the detection of anaemia in association with a characteristic epidemiological picture, and confirmed at postmortem by the finding of large numbers of H. contortus in the abomasum. The detection of impending haemonchosis relies chiefly on periodic monitoring for anaemia, including through the 'FAMACHA' conjunctival-colour index, or through faecal worm egg counts and other laboratory procedures. A range of anthelmintics for use against H. contortus is available, but in most endemic situations anthelmintic resistance significantly limits the available treatment options. Effective preventative programmes vary depending on environments and enterprise types, and according to the scale of the haemonchosis risk and the local epidemiology of infections, but should aim to prevent disease outbreaks while maintaining anthelmintic efficacy. Appropriate strategies include animal management programmes to avoid excessive H. contortus challenge, genetic and nutritional approaches to enhance resistance and resilience to infection, and the monitoring of H. contortus infection on an individual animal or flock basis. Specific strategies to manage anthelmintic resistance centre on the appropriate use of effective anthelmintics, and refugia-based treatment schedules. Alternative approaches, such as biological control, may also prove useful, and vaccination against H. contortus appears to have significant potential in control programmes.
Publication Type: Book Chapter
Source of Publication: Advances in Parasitology, v.93, p. 181-238
Publisher: Elsevier academic Press
Place of Publication: London, United Kingdom
ISBN: 9780128103968
9780128103951
Field of Research (FOR): 070708 Veterinary Parasitology
HERDC Category Description: B1 Chapter in a Scholarly Book
Other Links: https://nla.gov.au/anbd.bib-an57622168
Series Name: Advances in Parasitology
Series Number : 93
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Appears in Collections:Book Chapter
School of Environmental and Rural Science

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