The infectivity of surviving Psoroptes ovis (Hering) on cattle treated with ivermectin.
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.
D000818:Animals; D002417:Cattle; D005260:Female; D007559:Ivermectin; D007783:Lactones / Q000627:therapeutic use*; D008924:Mite Infestations / Q000188:drug therapy / Q000469:parasitology / Q000662:veterinary*; D008925:Mites / Q000254:growth & development*; D013997:Time Factors
D007783:Lactones; D007559:Ivermectin