Microscopic changes in the colon of puppies at experimental infection with parvovirus isolator cultivated in heterologous cell culture
Abstract
The article presents the results of the study of histological changes in the cecum, and colon of dogs for experimental infection with parvovirus enteritis. The histological examination of the small intestine, selected from corpses (n = 5) of puppies, dental labradorus with unborn, was infected with field isolator of parvovirus cultured on heterologous cell cultures (kidney kidney hamster (BHK-21), rabbit kidney (RK-13) and the renal mumps (SPEV). The presence of parvovirus, without any other association in experimental animals, is confirmed by the ELISA method and the solid-phase ELISA system. The purpose of this work was to study and characterize the microscopic changes in the colon for experimental contamination of dogs by parvovirus enteritis. The work was carried out at the Faculty of Veterinary Medicine of Zhytomyr National Agroecological University (ZNAEU). Anatomy of the animals was carried out in the special laboratory of the Department of Anatomy and Histology. The material of the study was pathological material taken during the pathoanatomical dissect of the puppies (n = 5), after experimental infection and euthanasia. The section of the cecum and the сolon, were investigated. The main method used in the work was a histological study, and a description of the microstructural changes in the tissues of the organs. Histological studies of the bladder and intestine showed that microscopic changes in their walls were segmental. Some parts had well preserved the spots. Only moderate uneven swelling of the submucosal base, an increase in its blood vessels, and edema and partial lysis of collagen fibers are registered. In other areas, destruction was recorded. In some cases, only the upper part of the crypt disappeared. The cript stroma was disorganized and suppressed, while in the nuclei of a sufficiently large number of epithelial cells in the upper crypts, eosinophilic inclusions were recorded. In the large intestine, puppies for experimental infection with parvovirus isolate, cultured in the heterologous culture of the lesions, are localized in the cecum and the colon and have a segmental nature: in some areas the crypts is well preserved, while in others the destruction of the crypts is recorded. Local reaction of the system of specific immunity is characterized by hypertrophy of isolated and congested lymphoid nodes. There are small cells of lymphocyte necrosis. In the nuclei of the epithelial cytoplasm, as well as in the nuclei of the lymphocytes, eosinophilic inclusions of the corpuscles are detected.
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