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- W2051270316 abstract "Martin P. J., Le Jambre L. F. and Claxton J. H. 1981. The impact of refugia on the development of thiabendazole resistance in Haemonchus contortus. International Journal for Parasitology11: 35–41. Beginning with a mixture of 5% thiabendazole-resistant and 95% non thiabendazole-resistant Haemonchus contortus larvae, worm free sheep were artificially infected with either 10,000, 9000, 7000, 2500 or zero larvae. Four weeks later, the infected sheep were treated with 44 mg/kg of thiabendazole. Seven days after anthelmintic treatment the same sheep were infected with zero, 1000, 3000, 7500 or 10,000 larvae respectively so that each sheep was given a total of 10,000 larvae. The larvae given after thiabendazole treatment are referred to as being in refugia (defined as an area where individual members of a population can escape exposure to a drug). This was repeated for six generations of parasites, maintaining the same proportion of larvae in refugia in each generation. The egg hatch assay for resistance indicated that refugia delayed the development of resistance in Haemonchus contortus. Where none or a small proportion of larvae were in refugia, a rapid increase in resistance occurred. With an increased proportion of larvae in refugia, resistance was slower to develop. Population size, as estimated by faecal egg counts done after anthelmintic treatment and corrected for the number of larvae given in each treatment, was lower at the higher levels of refugia. This was due to a lower level of resistance in the higher refugia lines and consequently a greater effect of the drug. However, the estimate of population size, from egg counts done after the larvae introduced from refugia had matured, were similar in all lines." @default.
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- W2051270316 date "1981-02-01" @default.
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- W2051270316 title "The impact of refugia on the development of thiabendazole resistance in Haemonchus contortus" @default.
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- W2051270316 doi "https://doi.org/10.1016/0020-7519(81)90023-0" @default.
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