Pathological and Epidemiological Study on Newcastle Disease in Broiler Chicken Farms in Egypt between 2021-2022. | ||||
| Journal of Current Veterinary Research | ||||
| Volume 6, Issue 1, April 2024, Page 226-245 PDF (2.03 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jcvr.2024.352715 | ||||
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| Authors | ||||
Hadeer Mohamed Abdelaty Khair; Salah El Ballal; Ahmed El-Shemy ; Anis Anis* ; Amanallah El-Bahrawy
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| Abstract | ||||
| Newcastle disease virus (NDV) is an economic threat to the poultry industry worldwide. In this study, we aimed to investigate the incidence of NDV in the vaccinated Egyptian poultry flocks through histopathological and molecular investigation. One hundred and nine broiler chicken flocks were examined during the period from January 2021 to December 2022from seven different Egyptian governorates (El-Beheira, ElFayoum, El-Gizza, El-Gharbia, El-Menofia, El-Qalyubia, and El-Sharqia). History, clinical signs, and gross examination of the affected flocks were recorded. Brain, nostril, trachea, lung, heart, proventriculus, duodenum, liver, pancreas, thymus, spleen, bursa, cecal tonsil, and kidney were collected for histopathological examination and only the tracheal tissues for Real-time polymerase chain reaction (RT-PCR). The most observed gross lesion in the examined samples was the hemorrhage in the proventriculus. Histopathologically, cerebral spongiosis, brain vasculitis, rhinitis, tracheitis, pneumonia, pericarditis, hemorrhage in the proventriculus, enteritis, perihepatitis, necrotizing pancreatitis, lymphoid depletion of the immune organs, and proliferation of lymphoid tissue in kidney. Furthermore, lymphoid proliferation was detected in the lung, proventriculus, and liver. From the examined samples, only forty- three samples were found to be positive by RTPCR, which represented 39.5% of the total samples. From our results, we can conclude that NDV circulates in the vaccinated broiler flocks in Egypt. Therefore, reconsidering the immune status, vaccination programs, and surveillance of newly emerged strains are essential to reduce the incidence of ND in Egypt. | ||||
| Keywords | ||||
| NDV; Broiler; Egypt; Gross pathology; Histopathological; RT-PCR | ||||
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