When to do a faecal egg count reduction test

Traditional intensive anthelmintic treatment strategies were introduced in order to control the prevalence and disease of Strongylus spp., specifically S. vulgaris, in the 1960s [1]. Since the introduction of intensive treatment there has been a dramatic reduction in the prevalence of S. vulgaris and related disease, however, such intensive anthelmintic usage has resulted in high selection pressure for the development of resistance in other nematodes [2,3]. Once resistance has developed, the chance of reversion to susceptibility is very slim even if selection pressure is removed by discontinuing use of the drug [4,5] ...