A total of 110 shepherd dogs registered as police dogs were examined clinically and roentgenographically in 1972 and 1973. Disorders including hip dysplasia, were found in 60.9% of them. Their occurrence in Japan was close to that in some Western countries.
A bivalent vaccine consisting of Japanese B encephalitis (JE) live virus and ultravioletinactivated porcine parvovirus (PP) was examined for innocuity and potency in pigs. When injected with the bivalent vaccine, pigs showed no clinical manifestation, but formed HI antibodies against JE virus and PP. The titers of these antibodies were equivalent to those obtained with control monovalent vaccines, indicating that the combined vaccine was available for practical use. There were no marked differences in the result of parturition among the groups of pigs which had received the bivalent vaccine or either control monovalent vaccine and nonvaccinated antibodypositive control pigs. No potency of the bivalent or control monovalent vaccines was proved on this result, because neither mummification nor malformation occurred to the nonvaccinated control group, and because commn stillbirth was often seen in every vaccinated group.
A few infective larvae of bovine lungworm, Dictyocaulus viviparus, survived winter in Hokkaido, although they showed a decrease in infectivity. In five experiments conducted during four springs, young susceptible calves were grazed on plots contaminated with D. viviparus 7-8 months before. In only one experiment, the calves suffered from a heavy bovine lungworm infection when grazed on some plots contaminated extremely with the paresite in the previous autumn.
Nine strains of Haemophilus parehaemolyticus were isolated from 9 swine affected with pleuropneumonia on 3 hog farms in Niigata Prefecture, and examined for MIC to chemotherapeutics. They were very highly susceptible to 10 agents, including streptomycin, kanamycin, tetracyclin, and chloramphenicol, showing an MIC of 0.75-0.1 mcg/ml. Their MIC was within a therapeutically effective range of 12.5-1.5 mcg/ml in the case of 9 agents, including penicillin G, leucomycin, and tylosin.