using artificially infected sheep , the response of a laboratory strain of haemonchus contortus , which had not been subjected to anthelmintics for three years , was compared with that exhibited by a parbendazole resistant field strain following treatment with each of seven anthelmintics , the laboratory strain proved fully susceptable to thiabendazole , parbendazole , cambendazole , mebendazole , fenbandazole , levamisole and haloxon , in contrast to the field strain which showed a moderate to marked resistance to all five benzimidazoles , but was fully susceptible to levamisole and haloxon .
C0025023
mebendazole
C0005050
benzimidazoles