Journal article
Resistance of Trichostrongylus colubriformis to levamisole and morantel: Differences in relation to selection history
Veterinary Parasitology, Vol.21(4), pp.255-263
1986
Abstract
Two field strains of Trichostrongylus colubriformis were tested by in vitro and in vivo methods for resistance to morantel, levamisole and thiabendazole and compared with an anthelmintic-naive laboratory-passaged strain (McM). One field strain (TAS) was isolated from a dairy goat herd which had experienced severe helminthiasis despite intensive anthelmintic usage. The other (BCK) was isolated from sheep which had been treated solely with levamisole over a 6-year period. The BCK strain had very high levels of both levamisole and morantel resistance. In contrast the TAS strain was resistant to morantel but highly susceptible to levamisole. This finding is contrary to the expectation that selection with morantel automatically confers resistance to levamisole, the converse of which was shown to apply in the BCK strain. Although the TAS strain was exposed to levamisole prior to isolation, examination of the drug's pharmacokinetics in goats indicated that it exerted little if any anthelmintic effect, and therefore selection pressure, on the parasite population. This study suggests that the mechanism of levamisole resistance covers a wide spectrum, and embraces that for morantel. It also suggests that in order to conserve the effectiveness of the levamisole/morantel group of broad spectrum anthelmintics, morantel should be used to the exclusion of levamisole until resistance is detected, at which time levamisole may be introduced to re-establish high levels of control.
Details
- Title
- Resistance of Trichostrongylus colubriformis to levamisole and morantel: Differences in relation to selection history
- Authors/Creators
- P.J. Waller (Author/Creator) - McMaster-CarrR.J. Dobson (Author/Creator) - McMaster-CarrD.L. Obendorf (Author/Creator) - Department of Agriculture, Mt. Pleasant Laboratories, P.O. Box 46, Launceston South, Tasmania 7249, AustraliaR.J. Gillham (Author/Creator) - Department of Agriculture, P.O. Box 20, Huonville, Tasmania 7109, Australia
- Publication Details
- Veterinary Parasitology, Vol.21(4), pp.255-263
- Publisher
- Elsevier BV
- Identifiers
- 991005543137707891
- Copyright
- © 1986 Published by Elsevier B.V.
- Murdoch Affiliation
- Murdoch University
- Language
- English
- Resource Type
- Journal article
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- Citation topics
- 1 Clinical & Life Sciences
- 1.163 Parasitology - General
- 1.163.1022 Anthelmintic Resistance
- Web Of Science research areas
- Parasitology
- Veterinary Sciences
- ESI research areas
- Plant & Animal Science