Epizootological data of cattle infection caused by bacillus cereus on a dairy farm of the Kemerovo region

Abstract

Diseases caused by Bacillus cereus of non-food origin are becoming relevant. This article describes a case of an epizootic situation associated with the spread of B. cereus through cattle feed and its ubiquitous distribution to all environmental objects and animal biotopes on the farm. B. cereus can cause not only food poisoning but also a generalized form of the infectious process, characterized by severe intestinal stagnation with a thickened and edematous wall, hemorrhages on the mucosal surface, catarrhal enteritis, systemic lymphadenopathy, degeneration of muscle fibers, interstitial pneumonia with pulmonary edema and pericardial effusion, meningeal and splenic hyperemia, glomerulonephritis and renal liver failure. Bacillus cereus was the predominant microorganism in quantitative terms with the specified pathoanatomical picture. Microorganisms of the Enterococcuscea, Staphylococcuscea families were found together with B. cereus. B. cereus was found in biological material (cervical mucus, nasal discharge) from live animals and in environmental objects. The removal of contaminated feed from the diet of animals led to a decrease in the death of livestock. It was concluded based on this that the main factor in the transmission of the pathogen was the food supply.