Population genetics of benzimidazole-resistant Haemonchus contortus and Haemonchus placei from buffalo and cattle: implications for the emergence and spread of resistance mutations
نویسندگان
چکیده
منابع مشابه
The presence of benzimidazole resistance mutations in Haemonchus placei from US cattle.
Haemonchus populations were collected from cattle from mid-western and eastern Southern US (four and six populations, respectively) to determine the relative prevalence of Haemonchus contortus and Haemonchus placei and the frequency of the three isotype-1 β-tubulin polymorphisms associated with benzimidazole resistance. A minimum of 32 individual adult worms were genotyped at position 24 of the...
متن کاملHaemonchus placei and Haemonchus contortus are distinct species based on mtDNA evidence.
Debates continue over the extent to which the parasitic trichostrongylids Haemonchus placei and Haemonchus contortus hybridise in nature, and whether they deserve species status. Mitochondrial ND4 gene sequences from individuals of each putative species collected from populations around the United States indicate that the two species are highly differentiated at the mtDNA level. Furthermore, th...
متن کاملBenzimidazole-resistant Haemonchus contortus--the effect of cryopreservation on the resistance of successive generations.
Infective larvae (L3) of a strain of benzimidazole-resistant Haemonchus contortus were stored in the gas phase of liquid nitrogen, thawed and used to infest worm-free sheep from which, in turn, larvae were cultured, frozen and thawed. This cycle was repeated 5 times. Thereafter, the progeny of the cryopreserved larvae were compared with the progeny of the original untreated larvae for susceptib...
متن کاملGenetics of Resistance to Haemonchus contortus infections in sheep
........................................................................................................................................ 17 Introduction ................................................................................................................................... 17 Materials and Methods ..........................................................................................
متن کاملMicroclimatic effect on vertical migration of Haemonchus contortus and Haemonchus placei third-stage larvae on irrigated Kikuyu pasture.
The influence of microclimate on numbers of third-state larvae of haemonchus contortus and Haemonchus placei in four strata of irrigated Kikuyu pasture was assessed. On 36 different, interspersed days three replicates of pasture samples were collected on three occasions per day from 1990-1992 for larval recovery and the log10 mean counts of the larvae recovered were analysed by use of ANOVA mod...
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ژورنال
عنوان ژورنال: Parasitology Research
سال: 2018
ISSN: 0932-0113,1432-1955
DOI: 10.1007/s00436-018-6055-8