The infectivity of surviving Psoroptes ovis (Hering) on cattle treated with ivermectin |
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Authors: | F S Guillot W P Meleney |
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Institution: | U.S. Livestock Insects Laboratory, Agricultural Research, Science and Education Administration, USDA, P.O. Box 232, Kerrville, TX 78028, U.S.A. |
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Abstract: | Ivermectin, 22,23-dihydroavermectin B1 (Merck MK-933), injected intramuscularly at the rate of 200 microgram kg-1 body wt., completely eliminated Psoroptes ovis populations from 6 Hereford cattle within 2 weeks after treatment. However, mites surviving 1, 3, and 5 days after treatment were viable and infective when transferred to untreated cattle. Mites surviving 7 days after treatment did not cause scabies or establish a colony of mites when transferred to untreated cattle. These results indicate that cattle treated with ivermectin for control of psoroptic scabies should be isolated from other cattle for at least 5 days after treatment. |
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