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  • Title: Failure of a single treatment with ivermectin to control sheep scab (Psoroptes ovis) on artificially infested sheep.
    Author: Bates PG, Groves BA.
    Journal: Vet Rec; 1991 Mar 16; 128(11):250-3. PubMed ID: 2035216.
    Abstract:
    Ivermectin at 200 micrograms/kg bodyweight given either as a single subcutaneous injection or as an oral drench failed to eradicate Psoroptes ovis from artificially infested sheep. The oral drench reduced the mite populations by 43 per cent within 24 hours but no further significant decline was recorded over 38 days. The subcutaneous injection reduced the mite populations by 90 per cent after 10 days but live P ovis were present on all the treated animals 84 days after treatment. The efficacy of treatment was less the higher the initial mite burden. The injection had no effect on clinical sheep scab, and the disease continued to progress despite the mite mortality.
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