Organopathology of streptococcosis in pigs in the group of fattening

Abstract

The objective of this paper is to determine the macroscopic changes in the internal organs of pigs with streptococcosis, that is, to study organopathology of this disease with the aim of improving pathology and differential diagnostics of diseases in pigs. The object and material of the study were 34 pigs of the fattening group with pathoanatomical changes characteristic of streptococcosis. The autopsy was performed by method of full evisceration developed by G. V. Shor. During the autopsy, imprint smears from the surfaces of the inflamed epicardium and heart valves were prepared and fixed with ethyl alcohol. Later, the smears were colored with Diff-Quick paint, observed with a microscope for biological research N-100B and photographed with the help of a digital camera Levenhuk C510. Samples of pathological material were taken from 9 pigs to perform bacteriological research on streptococcosis: fragments of the heart, including inflamed valves, as well as exudate from the heart sac. As a result of the study, it was found that organopathology of streptococcosis in pigs of the fattening group is represented by an increase in many lymph nodes and spleen, pericarditis, endocarditis, myocarditis, white embolic infarcts in the renal cortex, pleurisy, arthritis, and serous meningitis. Inflammation of the pericardium was serous-fibrinous, fibrinous and fibrinous-fibrous. Inflammation of the endocardium in the form of vegetative endocarditis was found mostly on the bicuspid valve, in a smaller number of pigs - on the tricuspid valve, in 2 animals on the semilunar valves of the pulmonary artery. In myocarditis, the heart muscle was heterogeneous in color and consistency: there were gray areas of softened consistency. The presence of complex "pericarditis-endocarditis-myocarditis" in pigs is pathognomonic for streptococcosis. Hemolytic streptococci of 3 types: Streptococcus dysgalactiae, subsp. Equisimilis,Enterococcus (Streptococcus) faecalis and Streptococcus suis were isolated from pathological material.