PATHOMORPHOLOGICAL CHANGES IN THE RESPIRATORY ORGANS AND SOME ASPECTS OF THE PATHOGENESIS OF DICTYOCAULOSIS IN ELK

Abstract

Objective of research: studying of pathomorphological changes in the respiratory organs of elk with dictyocaulosis. Materials and methods: A helminthological autopsy of the elk spontaneously infected with Dictyocaulus eckerti was performed. The infected pieces of lung located close to the edge of the healthy tissue were used for histological examination. The material has been preserved in 10% neutral buffered formalin solution. Paraffin histological sections having the 5–7 mkm thickness were produced according to the standard methods. The sections were stained with haematoxylin and eosin. The photomicrography was made with the camera «Digital» on microscope «Genaval». Results and discussion: In lungs of the elk infected with D. eckerti, the essential structural changes were detected. D. eckerti larvae were found in granulomas in the lumens of small and medium-sized bronchi. The pathohistological examination of lungs of the young elk allowed to detect multiple parasitic granulomas, hyperthermic and hemorrhagic foci. In places of parasite localization the lung interstitial tissue becomes thickened due to the infiltration by lymphoid, eosinophilic cells, single neutrophils and histiocytes as well as due to the growth of connective tissue.

Keywords

• elk
• dictyocaulosis
• lungs
• lymphocytes
• granuloma