An anthelmintic test for larval stages of sheep nematodes.

In recent years marked progress has been made in the efficacy of new anthelmintics. Many thousands of these compounds are synthesized by the pharmaceutical industries and the primary and secondary laboratory animal screens, through which they pass initially, have been carefully described and reviewed in the literature(Standen, 1963; Baker, 1963). After undergoing these tests promising compounds are subjected to clinical and field trials in domestic animals.