PATHOHISTOLOGICAL IMAGES OF THE INTESTINE OF SAIGA TATARICA TATARICA ASSOCIATED WITH MONIEZIA EXPANSA INVASION
PATHOHISTOLOGICAL IMAGES OF THE INTESTINE OF SAIGA TATARICA TATARICA ASSOCIATED WITH MONIEZIA EXPANSA INVASION
DOI:
https://doi.org/10.52578/2305-9397-2025-3-1-38-46%20Ключевые слова:
moniezia expansa, duodenum, histological changes, inflammation, necrosisАннотация
This study is devoted to morphological and histological changes in the intestines of saigas (Saiga
tatarica) infected with the cestode Moniezia expansa. The results show that parasitic invasion is
accompanied by pronounced pathological changes, mainly in the duodenum and colon. Macroscopically,
wrinkled, bumpy intestinal walls resembling beads, edema and hyperemia of the mucous membrane, as
well as hemorrhages and exudation were observed. Histological examination revealed numerous nodular
folds and hyperplasia of the mucosa, increased depth of crypts, degenerative-necrotic changes in the
epithelium, wave-like deformation and lysis of smooth muscle fibers. Microcirculation disorders in the
form of blood stasis and accumulations of formed elements were also recorded. A large number of
intraepithelial lymphocytes were observed in the epithelial layer, indicating an inflammatory process and
partial necrosis. The subserous membrane was characterized by lymphocyte infiltration and the presence
of small vessels in the connective tissue. The frequency of individual signs ranged from 60% to 90% in the
samples examined (n=13), with the most pronounced changes observed in the mucous membrane and
muscle layers of the duodenum. The data obtained indicate that M. expansa has a complex destructive effect
on the intestinal structures of saigas, causing inflammatory and degenerative processes that can significantly
weaken the health of the population. The presented materials allow for a deeper understanding of the
pathogenesis of parasitic diseases in wild ungulates and enable the use of these data in veterinary
diagnostics and the development of biosecurity measures.
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