Histopathological findings in spectacled caimans (Caiman crocodilus) with respiratory and ocular syndrome

Noor Kamal Azlin, Sufiah Umaira’ (2023) Histopathological findings in spectacled caimans (Caiman crocodilus) with respiratory and ocular syndrome. [Project Paper] (Submitted)

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Abstract

Respiratory disease has emerged as a prominent health concern in captive crocodilians. While other countries such as Zimbabwe, South Africa, and Thailand have reported outbreaks of ocular and respiratory syndrome in crocodilians, such data is lacked in Malaysia. Some of the reported pathogens known to cause this syndrome in juvenile crocodilians are poxvirus and Chlamydiosis. The objective of this study is to describe and assess the histopathology of the respiratory and ocular tissues of spectacled caimans (Caiman crocodilus) affected by this syndrome. Samples of lungs, trachea, epiglottis, eyes, and eyelids form spectacled caimans with ocular and respiratory syndrome between November 2022 and August 2023 were used in this study. They were processed and stained with haematoxylin and eosin (HE) stain, as well as special stains (Gram stain, Giemsa stain, and Ziehl-Neelsen stain). Any pathological findings were documented and were scored. Using the routine stain, the lungs displayed the most types of lesions, with 9 different lesions such as granulomas, emphysema, goblet cell hyperplasia and thicken septa. While the eyelid exhibited the least type of lesion. Analysis of the lesion severity score revealed that the lungs showed the highest severity mean 13.00 ± 1.87, which is not significant (p>0.05) compared to the other tissues. In contrast, the eyes exhibited the least severe score of 2.00 ± 1.00. Moreover, the lungs exhibited positive results in all special stain tests. This contradicted the findings in both the epiglottis and eyes, where no abnormalities were detected under special staining. In conclusion, based on the comprehensive histopathological examinations conducted, this study underscores that the lungs exhibited the most significant findings, evident both in routine and special staining techniques. The likely causative agents for ocular and respiratory syndrome in these spectacled caimans based on the lesions are Gram-negative bacteria such as

Item Type:	Project Paper
Faculty:	Faculty of Veterinary Medicine
Depositing User:	Ms. Nordeena Abdul Aziz
Date Deposited:	15 Nov 2024 01:51
Last Modified:	15 Nov 2024 01:51
URI:	http://psaspb.upm.edu.my/id/eprint/2117

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