A dog was suspected to be afected with idiopathic myocardosis in the clinical examination. When it was subjected to cardio-echography (CEG), it exhibited an increase in volume of the left ventricle, the left cardiac hypofunction, and a decrease in the ability of cardiac muscle to contract. Therefore, a diagnosis of congestive myocardosis was made in it. The parameters useful for the diagnosis of this disease by CEG were the volume of the left ventricle, the expelled fraction, the average reduction rate of the left intraventricular circumference, the amplitude of movement of the posterior wall of the left ventricle, the velocity of contraction of the posterior wall, the rate of inflow at diastole, and the rate of dilatation of the posterior wall.
A hog barn which had been used for an infection experiment with Toxoplasma oocysts was cleaned carefully and disinfected with flame. Two pigs were raised independently in two stalls, respectively, in this barn beginning with 75 days after oocyst administration. They manifested clinical symptoms 9 and 14 days and died 20 and 22 days, respectively, after the introduction into the barn. The cause of death was assumed to be infection with oocysts remaining in the barn. When the barn was disinfected again with hot water, healthy pigs were introduced in it and held under observation for 8 weeks, but they remained free from infection. In another experiment, healthy pigs began to be housed in a hog barn where an infection experiment was performed with cyst administration 35 days before and no disinfection had been conducted since then. None of them were infected over an observation period of 11 weeks. These results indicate that oocysts remained in the contaminated barn for a long time and caused toxoplasmosis. Disinfection with abundant hot water seems to be effective for the contaminated hog barn.
The rates of detection of bacteria from the milk of the cows clinically infected with gangrenous mastitis and examined in this experiment are as follows: Escherichia coli, 50.9%; Pseudomonas aeruginosa, 17.0%; Klebsiella pneumoniae, Enterobacter aerogenes, Clostridium perfringens, Bacillus cereus, Staphylococcus aureus, and Streptococcus sp., 4.6% each; Alcaligenes faecalis, Acinetobacter anitratus, and Corynebacterium pyogenes, 1.5% each. These bacteria were isolated from the affected udders and some mammary lymph nodes, but from few important organs. When the E. coli isolates were classified into serotypes, 5 strains belonged to O2, 2 strains each to O8, O75, and O88, and 1 strain each to O9, 064 O76, and O89. When the P. aeruginosa isolates were examined in the same manner, 2 strains each belonged to types E, F, and I and 1 strain each to types A, B, and G. The E. coli strains were sensitive to CL, CP, CTC, FM, KM, OTC, and SM, and the P. aeruginosa strains relatively sensitive to CL and SM.