Features of pathomorphological manifestation of low pathogenic influenza in laying hens

Abstract

Relevance. In the available literature, there are enough works devoted to the study of pathomorphological changes in low pathogenic influenza. The described changes are not sufficiently systematized, including in laying hens.Methods. The material for the research was the corpses of 60 laying hens, 235–428 days old, egg crosses “Tetra”, “Hisex Brown”, “Dekalb White”, killed for diagnostic purposes. Research methods: autopsy, histological examination.Results. Leading macroscopic changes: cyanosis of the comb and earrings; acute serous-catarrhal rhinitis, laryngotracheitis; acute fibrinous-purulent sinusitis; acute catarrhal or fibrinous-hemorrhagic pneumonia, pulmonary edema; yolk peritonitis; granular and fatty degeneration, acute venous hyperemia of the liver, kidneys and myocardium; hemorrhages in the epicardium. The most characteristic histological changes: necrosis and desquamation of the integumentary epithelium of the larynx and trachea, inflammatory hyperemia, fibrinoid swelling of the walls of the vessels of microvasculature, hemorrhages, serous edema, pronounced lymphoid-macrophage and plasma cell infiltration of the mucous membrane; croupous pneumonia with a pronounced hemorrhagic accent, lymphoid-macrophage infiltration of the mucous membrane of the bronchi and parabronchi of the lungs, fibrinoid swelling of the walls of the vessels of microvasculature, hemorrhages, emphysema; hemorrhages in the serous membrane of the esophagus, in the mucous membrane of the duodenum, jejunum, ileum and caecum; acute venous hyperemia, serous edema, granular, smalland large-drop fatty degeneration of hepatocytes of the liver, fibrinoid swelling of the walls of the vessels of microvasculature, hemorrhages; acute venous hyperemia of the kidneys, serous edema, large-drop fatty and vacuolar degeneration of the epithelium of the urinary tubules, fibrinoid swelling of the walls of the vessels of microvasculature, hemorrhages; acute alterative myocarditis; fibrinoid swelling of the walls of the vessels of microvasculature of the spleen, hemorrhages; acute venous hyperemia of cerebral vessels, pronounced perivascular and pericellular edema.