Fig. 3
From: A nationwide survey of anthelmintic treatment failure on sheep farms in Ireland
Multiple anthelmintic classes tested on the same farm. Venn diagram summary of results from drench tests on the same farm and involving more than 1 anthelmintic class (BZ = benzimidazole; LV = levamisole; ML = macrocyclic lactone). The number (%) of effective tests for each anthelmintic group is given in the corresponding set; set intersections show cases where multiple anthelmintics were effective. The numbers outside the sets represent the number of farms on which multiple anthelmintics were ineffective. a farms (n = 4) that provided results for BZ, LV and ML; b farms (n = 34) that provided test results for BZ and LV; c farms (n = 54) that provided test results for BZ and ML; d farms (n = 29) that provided results for LV and ML