ABSTRACT
Psoroptes ovis was not transmitted by natural contact to susceptible cattle which were exposed to infested, ivermectin-treated cattle 6, 12, 14, 16, and 18 days after treatment was given. However, clinical scabies did develop in 2 calves naturally exposed to P ovis-infested, ivermectin-treated calves at 10 days after treatment was given subcutaneously (200 micrograms/kg). Psoroptes ovis was transmitted to stanchioned cattle manually exposed to 200 to 300 ml of hair and skin scrapings from infested, ivermectin-treated cattle at 6, 10, 12, 14, and 16 days after treatment was given subcutaneously (200 micrograms/kg). Scabies did not develop in cattle exposed to skin scrapings obtained from infested, treated cattle at 18 and 20 days after they were treated with ivermectin. The 14-day isolation of P ovis-infested, ivermectin-treated cattle from susceptible cattle recommended by the US Department of Agriculture, although marginal, is adequate under natural conditions to prevent transmission of scabies from treated to noninfested cattle.
Subject(s)
Cattle Diseases/transmission , Ivermectin/therapeutic use , Mite Infestations/veterinary , Animals , Cattle , Cattle Diseases/drug therapy , Mite Infestations/drug therapy , Mite Infestations/transmission , Mites , Time FactorsABSTRACT
Examination of 187 wild swine from 20 locations in 11 southeastern states revealed at least 25 species of endoparasites and 7 species of ectoparasites. Three parasites of public health importance (Sarcoptes scabiei, Spirometra sp, and Toxoplasma gondii) were disclosed by this study. The absence of Trichinella spiralis indicates that wild swine in the Southeast are not a reservoir for Tr spiralis.