Abstract:
Zoonotic metacestodes present a significant threat to both veterinary and public
health. Specifically, the prevalence of metacestodes is often concentrated
among consumers of raw meat and underdeveloped countries. The objective
of this study was to estimate the prevalence of condemned red offal and
examine the gross and histopathology features of zoonotic metacestodes. A
cross-sectional study was conducted from November 2022 to July 2023 at the
Bahir Dar municipal abattoir. A simple random sampling method employed in
the abattoir survey to investigate pathological changes of offal and its rate of
condemnation. Following a gross inspection of the red offal, representative
tissue samples collected and preserved in 10% neutral buffered formalin.
Subsequently, the size and number of cysts determined, and their viability and
fertility evaluated. Hematoxylin and eosin staining utilized to analyze various
lesions with microscope. A total of 340 cattle examined and 7.5% red offal
condemned due to hydatid cysts 4.12% in the lungs, 3% in the liver, 0.6% in the
kidneys, and 0.9% in other organs. Red offal condemned due to Cysticercus bovis
0.6% in the liver and 0.3% in the tongue. A statistically significance relationship
was found between lung rejection due to hydatidosis (p < 0.05), body condition
score, and origin of the animal. Among the detected calcified cysts, 83.34% of
C. bovis and 47.62% of hydatid cysts. Histopathological examination revealed
hydatid cysts and their oncospheres within the portal circulation, as well as
necrotized, calcified daughter cysts observed on Bowman’s capsule. The
alveoli and bronchiole parenchyma compressed with pressure of protoscolices
and it infiltrated by eosinophils. The cyst wall is attached to the thick hepatic
capsule of the liver, with the hepatic parenchyma displaying islands of irregular
hepatocytes. Cysticercus bovis detected in the deteriorated and necrotized
muscle bundles, along with granulomatous lesions characterized by infiltration
of mononuclear cells. Gross and histological examinations is invaluable tool
for diagnosing hydatidosis and cysticercosis, providing well-organized baseline
data to enhance our understanding the burden of zoonotic metacestodes.
