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  • Title: Anthelmintics.
    Author: Prichard RK, Ranjan S.
    Journal: Vet Parasitol; 1993 Feb; 46(1-4):113-20. PubMed ID: 8484204.
    Abstract:
    Anthelmintics remain the principal means for the prevention and control of subclinical and clinical ostertagiasis. The selection of an appropriate anthelmintic depends on whether one is controlling or preventing Type I ostertagiasis (caused by the establishment of adult worms derived from recently acquired infective larvae), preventing Type II (treating pre-Type II or inhibited larvae) or controlling Type II ostertagiasis (caused by the development of inhibited larvae to adults), or using the anthelmintic as part of an epidemiologically based plan to reduce pasture contamination with infective Ostertagia ostertagi larvae. In the latter case, the choice of an anthelmintic may depend on whether the targets for treatment are only adult worms and developing larvae or whether the targets include hypobiotic larvae. Thus for Ostertagia control, anthelmintics must be divided into those that normally control all stages, such as the avermectin group (ivermectin, abamectin and moxidectin) and some of the benzimidazoles (albendazole, oxfendazole and fenbendazole at appropriate dose rates), and those that only control adult worms and developing larvae (levamisole, morantel, coumaphos, phenothiazine and thiabendazole).
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