A seroepidemiological survey on bovine leucosis virus was conducted. Serological studies were analyzed by age groups and the sizes of herds. The number of reactors increased gradually with the advance in the age of cattle and the herd size. The highest rate of BIV carriers was found in the ages between 6 and 8 years, and in the size of herds with 20 to 50 heads. Two out of 6 specimens (33.3%) from the reactors showed the typical type C virus with the size of 90 to 110 nm around microvilli and in intracytoplasmic vacuoles

A seroepidemiological survey for antibodies to bovine leukemia virus in dairy and Korean native cattle in Kyungbuk area, Korea [R.] was performed using BLV p and gp antigens by the ID test. In the dairy cattle (Holstein), thirty of 106 sera (28.3%) form 14 dairy farms were positive for BLV antibodies and 12 of 14 pastures were contaminated with BLV. In the Korean native cattle, seventeen (2.4%) of 699 sera from the slaughter house in Taegu city were positive for BLV antibodies. Of 47 gp-ID positive cattle, 5(10.6%) had antibodies to p antigen

The biochemical properties of strains of Staphylococcus aureus isolated from cattle with peracute gangrenous mastitis, acute systemic mastitis and chronic mastitis were examined. Of 261 strains of Staphylococci isolated form quarters with clinical mastitis, 140 (53.6%) were classified as Staphylococcus aureus and 121 (46.4%) were coagulase-negative staphylococci. All the strains of Staphylococcus aureus isolated from quarters with peracute gangrenous mastitis and acute systemic mastitis showed production of alpha heamolysin, coagulase, lipase, phosphatase, nuclease and gelatinase, and fermentation of mannitol. However, of 114 strains of Staphylococcus aureus obtained from quarters with chronic mastitis, 64 (56.1%) possessed alpha lysin, and 43 (37.7%) produced lipase in egg yolk medium. The most common hemolytic pattern of the strains associated with chronic mastitis was Beta type

This experiment was carried out to know the 133 isolates of yeast-like fungi. The antifungal agents tested were nystatin, griseofulvin, cycloheximide, 5-fluorocytosine, miconazol, clorimazole and tolnaftate. In general, clotrimazole, miconazol and 5-fluorocytosine were more effective in antifungal activity in vitro against the test organisms than the rest of the agents tested. However, some of the isolates showed higher resistance to certain antifungal agents compared to the other isolated of the same species. They were: 1C. albicans isolate to 5-fluorocytosine: 1 C. albicans to 5-fluorocytosine, miconazol and clotrimazole: 1 c. krusei to 5-fluorocytosine and cycloheximide; and 11 C. tropicalis isolates to cycloheximide. The minimum inhibitory concentrations (MIC) of clotrimazole were 12.5 mg/ml or lower for all isolates tested except one C. albicans isolate, for which MIC of the drug was 100 g/ml. On the other hand, the MIC's of cycloheximide were 6.5 mg/ml or lower for all isolates except the following: all isolates of C. albicans (100 mg/ml), 11 C. pseudotropicalis (200 mg/ml) and Rhodotorula sp. (25-50 mg/ml), 11 C. tropicalis isolates (100 mg/ml) and 1 C. Krusei isolate (200 mg/ml)

This experiment was conducted to determine the effect of hypobaric hypoxia on PCV (packed cell volume), Hb conc. (hemoglobin concentration), RBC No. (red cell number) and red cell GSH (levels of reduced glutathione) and DPG (diphosphoglycerate) in the rabbit. There was a significant rise in all the parameters measured except DPG which did not change during and/or after the hypobaric hypoxia

This study was undertaken to clarify the histopathological changes of pigs naturally infected with hog cholera. Vascular cuffing of the brain was observed in about 97% of the natural cases and all of the experimental cases. Electron microscopic findings on cuffed blood vessels of the brain were endothelial cellular degeneration and infiltration of pleomorphic lymphoid cells. In the rabbits dosed with tissue suspension of the lymphoid organs and isolated hog cholera virus, high body temperature and vascular cuffing of the brain were more significant in pre-injected cases with indian ink