SUMMARYIn Auguts, 1987, on a large-scale raising farm of Japanese Black beef cattle, a herd of 9-monthold calves were introduced. About 10 days later, an outbreak of respiratory disease was observed, and three cattle died while four were eliminated.One dead and 10 affected cattle were submitted to bacteriological and pathological (ABC method) examinations, and P. haemolytica was significantly isolated from them. High antibody titers to the organism in blood were also observed. Although neither Micoplasma nor pathogenic viruses were isolated, a significant increase in antibody titer to bovine RS virus was observed. This respiratory disease was diagnosed as P. haemolytica infection, which was considered to be an opportunistic infection. The causative factors were pursued and a counterplan to stress, hygienic problems, and pathogenic microbes was established. As the result of the execution of this plan, no further outbreak was observed. Vet. Med. Assoc., 42, 319•`323 (1989).
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.