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36559

Protective Efficacy of Some Newcastle Disease Virus (NDV) Vaccination Programs Against Velogenic NDV Genotype VII in Broiler Chickens

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Last updated: 22 Jan 2023

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Abstract

The protective efficacy of live and inactivated NDV- genotype II vaccines against challenge with velogenic Newcastle disease virus (VNDV) genotype VII (Chicken/USC/Egypt/2014), was evaluated in vaccinated groups (G1, G2, G3, G4 and G5) with inactivated vaccine on day 7 and live vaccine (LaSota) on days 7 and 15, in addition, with live V4 strain either on day 1 (G1) or on day 25 (G2) or in both days 1 and 25 (G3) and challenged on day 32 of age. The protection percentages were 96%, 96%, 96% and 88% in G1, G2, G3 & G4, respectively, vs 4% in non-vaccinated challenged chickens (G5). Moreover, the tracheal and cloacal viral shedding were 30% & 100% ; 0% & 0% ; 0% & 30%; 0% & 30% in vaccinated challenged G1, G2, G3 & G4, respectively, vs 100% & 60% in non-vaccinated challenged G5 at 3 DPC, whereas, the tracheal and cloacal viral shedding were 0% & 30% ; 0% & 0% ; 0% & 0% ; 30% & 60% in vaccinated challenged G1, G2, G3 & G4, respectively, vs 100% & 100% non-vaccinated challenged G5 at 7 dpc. However, the clinical signs, gross lesions and serological response were monitored till 14 dpc. Our results revealed that the inclusion of  V4 vaccine  strain in vaccination program is providing  superior protection against NDV genotype VII and good safely replace live (LaSota) in early and late vaccination practices.

DOI

10.21608/jcvr.2019.36559

Keywords

Vaccination, Newcastle disease, genotype VII, V4 strain

Authors

First Name

Rahma

Last Name

Shahin

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Affiliation

Birds and Rabbit Medicin Department, Fac. of Vet. Medicin, Sadat City University, Menofia, Egypt

Email

dr.gana2011@yahoo.com

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Orcid

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First Name

Yousef

Last Name

Yousef

MiddleName

-

Affiliation

Poultry Disease Department, Fac. of Vet. Medicin, Cairo University, Cairo, Egypt

Email

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City

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Orcid

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First Name

Mahmoud

Last Name

Ibrahim

MiddleName

-

Affiliation

Birds and Rabbits Medicine department, Faculty of Veterinary Medicine, Sadat City University, Menoufia, Egypt

Email

mahmoudgamil89@yahoo.com

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Volume

1

Article Issue

1

Related Issue

5738

Issue Date

2019-06-01

Receive Date

2019-03-01

Publish Date

2019-06-01

Page Start

103

Page End

114

Print ISSN

2636-4018

Online ISSN

2636-4026

Article File

JCVR_Volume 1_Issue 1_Pages 103-114.pdf

PDF . 1.2MB

Link

https://jcvr.journals.ekb.eg/article_36559.html

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https://jcvr.journals.ekb.eg/service?article_code=36559

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Original Article

Type Code

799

Publication Type

Journal

Publication Title

Journal of Current Veterinary Research

Publication Link

https://jcvr.journals.ekb.eg/

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Article

Created At

22 Jan 2023