Adaptation and evaluation of three different in vitro tests for the detection of resistance to anthelmintics in gastro intestinal nematodes of cattle

作者: J. Demeler , U. Küttler , G. von Samson-Himmelstjerna

DOI: 10.1016/J.VETPAR.2010.01.032

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摘要: Abstract Three different in vitro methods, the Larval Development Test (LDT), Migration Inhibition (LMIT) and Micromotility Meter (MMT) have been adapted to detect anthelmintic resistance cattle nematodes. Nematode eggs third stage larvae of Ostertagia ostertagi Cooperia oncophora isolates were obtained from faecal cultures experimentally infected calves. Additionally, adult C. evaluated MMT for detection ivermectin (IVM). For all three tests standard operating procedures (SOPs) established successfully used responses non-parasitic parasitic stages substances description dose–response curves. In LDT (IVM) thiabendazole (TBZ) tested, LMIT IVM levamisole (LEV) only was evaluated. Susceptible O. ostertagi, an IVM-resistant isolate a TBZ-selected (C. oncophora) or some these (O. ostertagi). sigmoidal curves EC50 values tested using four-parameter logistic model. LDT, previously reported problem development overcome with mean rates between 80% 87% negative controls. Following optimization incubation times, temperatures, mesh sizes (LMIT only), nutritive medium (LDT only) group size (MMT test systems reliably detected significant differences response susceptible (p

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