Histopathological Study of the Fibrotic Layer of Hydatid Cyst in Camel, Cow and Sheep

Abstract

Ali Mohammed Bahrami*, Sepideh Rajabi, Fatimah Vahedust

Hydatidosis or echinococcosis is one of the most important common diseases between humans and animal. Echino- coccosis granulose worm often causes hydatid cyst. The closest host tissue to the cyst is the fibrous layer. The purpose of this study is to investigate any differences in the fibrosis layer in the lung and liver of ruminants.

Methods: For each of these three animals, 22 infected lung or liver samples were collected from Tehran slaughter- houses during the months of May to July 2022. A piece of one square centimeter was removed from the fibrotic layer and from the healthy tissue near the cyst. In the usual process of section preparation, pathological observation was included. Sections were observed and reported by a pathologist.

Findings: In total, 138 sections were studied pathologically. The diameter of the cysts varied between 1.5-0.6 cm in camels and cattle and 0.5-0.2 cm in sheep. Most cases of sterile cysts were seen in cows. Fibrous layer was present in all (100%) of the 66 studied samples. Necrosis was observed in 20 cases (30.30%), including 12 cases in the lungs of camels, 6 cases in the lungs of cows, and only 2 cases, one in the lung and the other in the liver of sheep. Only one case (1.52%) of granuloma was observed in cow liver.

Conclusion: Differences were observed in the fibrotic layer of hydatid cyst in cows, camels and sheep. In all 3 types of animals, the rate of progression of the lesion was towards the formation of necrosis and granuloma, and the frequency of these lesions had a significant difference, which is due to the difference in the parasite strain, the host type, and also the average age of these animals.

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