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Protective effectiveness of two vaccination schemes against the prevalent Egyptian strain of Newcastle disease virus genotype VII
Faculty
Veterinary Medicine
Year:
2024
Type of Publication:
ZU Hosted
Pages:
Authors:
Nora Mohamed Abdelaziz Sadawy
Staff Zu Site
Abstract In Staff Site
Journal:
Open Veterinary Journal Faculty of Veterinary Medicine, University of Tripoli, Libya
Volume:
Keywords :
Protective effectiveness , , vaccination schemes against the prevalent
Abstract:
Background: Despite the strict preventive immunization used in Egypt, Newcastle disease remained a prospective risk to the commercial and backyard chicken industries. The severe economic losses caused by the Newcastle disease virus (NDV) highlight the importance of the trials for the improvement and development of vaccines and vaccination programs. Aim: In the present study, we evaluated the effectiveness of two vaccination schemes for protection against the velogenic NDV (vNDV) challenge. Methods: Four groups (A–D) of commercial broiler chickens were used. Two groups (G–A and G–B) were vaccinated with priming live HB1 GII simultaneously with inactivated GVII vaccines at 5 days of age, then boosted with live LaSota GII vaccine in group A and live recombinant NDV GVII vaccine in group B on day 16. Groups A to C were challenged with NDV/Chicken/Egypt/ALEX/ZU-NM99/2019 strain (106 Embryo infective dose 50/0.1 ml) at 28 days of age. Results: Two vaccination schemes achieved 93.3% clinical protection against NDV with body gain enhancement; whereas, 80% of the unvaccinated-challenged birds died. On day 28, the mean HI antibody titers were 4.3 ± 0.33 and 5.3 ± 0.33 log2 in groups A and B, respectively. As well as both programs remarkably reduced virus shedding. The two vaccination schemes displayed close protection efficacy against the vNDV challenge. Conclusion: Therefore, using the combination of a live attenuated vaccine with an inactivated genetically matched strain vaccine and then boosting it with one of the available live vaccines could be considered one of the most effective programs against current field vNDV infection in Egypt.
Author Related Publications
Nora Mohamed Abdelaziz Sadawy, "التكيس البطنى للطور المتحوصل من الديدان الشريطية في الأغنام: الآفة التشريحية و الصورة المجهرية مع التمييز الطفيلي. تقرير حالة.", لايوجد, 1900
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Nora Mohamed Abdelaziz Sadawy, "Clinical and histopathological studies on neurodegeneration and dysautonomia in buffalo calves during foot-and-mouth disease outbreaks in Egypt", Veterinary World, 2021
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Nora Mohamed Abdelaziz Sadawy, "Clinical and histopathological studies on neurodegeneration and dysautonomia in buffalo calves during foot-and-mouth disease outbreaks in Egypt", Veterinary World, 2021
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Nora Mohamed Abdelaziz Sadawy, "Clinical and histopathological studies on neurodegeneration and dysautonomia in buffalo calves during foot-and-mouth disease outbreaks in Egypt", Veterinary World, 2021
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