Dermatophilus congolensis was isolated from skin lesions of 2 Japanese Black cattle bred on different farms in Miyazaki Prefecture. In both cases, gross lesions demonstrated exudative inflammation and incrustation. Histopathological observation of severe parakeratosis and many branching mycelia led to a diagnosis of dermatophilosis. Isolates were sensitive in vitro to such antibiotics in veterinary usage as penicillin and streptomycin. Common disinfectants at conventional concentrations easily sterilized them. Intramuscular injections of the penicillin-streptomycin complex sol were effective and produced marked improvement in skin lesions in both cases. This is the first case of cattle dermatophilosis reported in Miyazaki Prefecture.
Seasonal changes in Trypanosoma theileri infection in grazing cattle (Japanese Black) were investigated by means of buffy-coat culture and indirect fluorescent antibody tests (IFT). Blood samples were collected from 24 cows every month from April to September. T. theileri was detected in 3 out of 24 (12.5%) of the samples collected before grazing in April. After the animals were put out to graze in a pasture, the detection rate of T. theileri increased toward the summer; and in September 14 out of 24 (58.3%) animals were positive. Throughout the investigation, the overall antibody titer was distributed in the range between 1: 40 and 1: 2, 560. The antibody titer in infected cows, however, ranged from 1: 80 to 1: 1, 280. Geometrical antibody-titer means increased toward summer, to reach a maximum of 1: 640.0 in September.
Six young Japanese black calves died within a few days demonstrating neurological signs such as tilted heads, ataxia, and collapse. Necropsy revealed cerebral edema, and rapid histological examination of one dead calf revealed cerebrocortical laminar necrosis, a characteristic sign of lead poisoning. Lead analysis of three calves revealed a higher concentration of lead in the blood than was found in unaffected calves. The source was discovered to be a piece of galvanized iron painted with paint containing lead. Its removal prevented additional occurrences of the illness.
The presence of Isospora oocysts was investigated in 1, 542 household dogs in relation to age, rearing conditions, origins, sex, breed, and fecal conditions. Isospora oocysts were detected in the feces of 96 of 1, 542 (6.2%) of the animals examined. The detection rates were higher in dogs aged 1-6 months and in dogs reared indoors. Rates were high in dogs from pet shops and breeding kennels. No significant sex-related differences in oocyst detection were observed. Rates were high in Chihuahuas and Papillons and low in mongrels. Rates of Isospora-oocyst detection were high in soft and diarrheic feces and still higher in feces including mucus and/or blood. On the basis of size, the oocysts detected were identified as I. canis and I. ohioensis.
A malignant oligodendroglioma of the right hypothalamus region occurred in a 9-year-old male dog (Yorkshire terrier, 4.7 kg). The tumor mass was soft and gelatinous. Histological examination revealed a honeycomb appearance and a perinuclear halo with many mitotic figures. Much vasoproliferation with extensive necrosis and calcification was observed in the parenchyma. Pathological findings in this case of canine oligodendroglioma coincided well with computed tomography and magnetic resonance imaging.
We excised a tumor from the inside of the right thigh of a five-year-old, male, Golden Retriever lame in the right pelvis. Seven days after surgery, normal walking and locomotion had been restored. Four weeks later, however, the tumor recurred, necessitating a second operation. This operation was only incompletely performed because the neoplasm had spread widely around the femur and the femoral artery and vein. The dog died in the third week after second surgery. Histopathological findings from collected samples led to a diagnosis of leiomyosarcoma. Metastasis had reached the lungs, liver, heart, diaphragm, kidneys, and prostate gland.
For rapid diagnosis of swine erysipelas arthritis during meat inspection, the growth agglutination test was used to measure antibody titers in swine synovial fluid and the latex agglutination test to measure swine serum antibodies. Correlation was obtained between the results of the two tests. In addition, the slide agglutination test was performed as a rapid screening method to detect the swine erysipelas antibody. Correlation was good between results of the slide agglutination test and the latex agglutination antibody-titer test. Furthermore, correlation between these tests and the results of Erysipelothrix rhusiopathiae isolation was good. Because they are both simple and time-saving, these tests are very useful in screening swine erysipelas arthritis during meat inspection.