ABSTRACT
The effects of a single artificial infestation with sarcoptic mite (Sarcoptes scabiei var. suis DeGeer) on weight gain and lymphocyte blastogenic responses were studied in untreated and fenvalerate-treated pigs. Average daily feed intake, average daily gain and feed efficiency were monitored for 5 weeks in 32 infested and 16 uninfested pigs. Total and differential leukocyte counts were determined and lymphocyte proliferative responses, using a mitogen-stimulated lymphocyte blastogenesis assay, were evaluated in 24 pigs. Sarcoptic mite infestation or treatment for sarcoptic mange did not affect total or differential leukocyte counts (P greater than 0.10). Differences were not observed in weight gain or lymphocyte blastogenic responses between infested and uninfested pigs.
Subject(s)
Scabies/veterinary , Swine Diseases/physiopathology , Analysis of Variance , Animals , Body Weight , Eating , Insecticides/therapeutic use , Leukocyte Count/veterinary , Lymphocyte Activation , Nitriles , Pyrethrins/therapeutic use , Random Allocation , Sarcoptes scabiei , Scabies/blood , Scabies/immunology , Scabies/physiopathology , Swine , Swine Diseases/blood , Swine Diseases/immunologyABSTRACT
Development and remission of the clinical signs of sarcoptic mange in pigs experimentally infested once and twice with Sarcoptes scabiei var. suis were described. Encrusted lesions in the ears of pigs and a general dermatitis were observed 3 weeks after infestation, but subsided gradually. Specific antibody activity, in titers averaging 1:16 000 in sera from rabbits immunized with mite extracts and 1:512 in the serum from a pig artificially infested with sarcoptic manage and then twice immunized with mite extract, was detected with the passive hemagglutination assay with tanned bovine red blood cells. Titers ranging from 1:40 to 1:160 were detected in sera from experimentally-infested animals. Only 3 of 75 sera from chronically naturally-infested pigs exhibited antibody titers of 1:40 to the mite extract.
Subject(s)
Antibodies/analysis , Antigens/immunology , Hemagglutination Tests/veterinary , Sarcoptes scabiei/immunology , Scabies/veterinary , Swine Diseases/immunology , Animals , Scabies/immunology , SwineABSTRACT
A naturally occurring hemagglutinating factor to tanned human O positive, ovine and porcine erythrocytes was found in extracts from Sarcoptes scabiei var. suis. This hemagglutinating factor did not react with bovine, equine or avian erythrocytes. This factor was demonstrated by microscopic examination of the tanned erythrocytes and by the passive hemagglutination assay.
