Mannheimiosis of cattle, sheep and goats

Respiratory diseases of farm animals cause great economic losses to cattle-breeding, sheep-breeding and goat-breeding enterprises. On the territory of the Russian Federation one of the most wide-spread respiratory diseases among cattle, sheep and goats is Pasteurellosis, with Pasteurella multocida and Mannheimia haemolytica ( earlier Pasteurella haemolytica) considered as its pathogens until not long ago. On the basis of the peculiarities and differences of the biological features of the mentioned microorganisms as well as on the basis of differences in aetiology, epizootiology, pathogenesis and clinicopathologic manifestations of the disease, infection caused by M. haemolytica was differentiated from Pasteurellosis and assigned to a new nosology - Mannheimiosis. In its turn Mannheimiosis is a Pasteurellosis-like disease, which needs some predisposing stress factors to appear. Unlike Pasteurellosis, Mannheimiosis does not appear independently, but can provoke secondary complications. Nowadays the peculiarities of Pasteurellosis are thoroughly studied, while there is not enough systematized data on Mannheimiosis. Due to all mentioned above we consider the relevance of the studies on Mannheimiosis of cattle, sheep and goats to be obvious. Presented work contents the information about microorganism M. haemolytica, the description of its cultural, morphological, biochemical and serological features, as well as factors of virulence of the pathogen, due to which pathogenesis of the infection develops. Moreover, there is information about the development of Mannheimiosis, the most typical signs of the infection, principles of laboratory diagnosis, treatment and specific prevention.