PATHOMORPHOLOGICAL CHANGES IN NEWBORN PIGS INDUCED BY INFECTION WITH VACCINAL STRAINS AND FIELD ISOLATES OF SUID HERPES VIRUS 1. PART II. RESPIRATORY SYSTEM

Comparative pathomorphological studies of newborn piglets prior to colostrum intake after infection with a vaccine strain and two uterothropic strains of the Aujeszky's disease strains – Mogila and Zagora II were performed. The studies were conducted with 21 large, well-developed piglets derived from an industrial pig farm, without antibodies to Suid herpesvirus 1. Histological, histochemical and electron microscopic studies have been performed. It was found that strains of the Aujeszky's disease, which differ in virulence and tissue tropism, caused different severity, characteristic clinical signs and pathomorphologic changes in experimental animals. The clinical signs are related to changes in the respiratory and digestive systems, bedsores and apathy. In the lungs of the pigs, infected with strain St. Zagora II and strain MK 35gE-, atelectatic and proliferative changes were observed. Serous – fibrinous pleuritis, fibrinogen necrotic pneumonia and the presence of inclusions type Cowdry A in the epithelial and connective tissue in lungs of the tested animals were inspected.