Abstract
The efficacy of vaccination with Newcastle disease (ND) La Sota and R2B (Mukteswar) modified live strain vaccines was determined by experimental challenge and with ND La Sota vaccine under field conditions in Nepal. Booster vaccination with ND La Sota vaccine after a primary vaccination with ND La Sota vaccine, induced a geometric mean titre (GMT) of 5.0 log2 haemagglutination inhibition (HI) units, compared to a GMT of 6.0 log2 HI units following booster vaccination with R2B vaccine 1 month after primary vaccination with ND La Sota vaccine. Both vaccines provided 100% protection against challenge with a local field ND strain. Furthermore, booster vaccination with ND La Sota vaccine induced protective levels of antibody after field use in villages in Jhapa, and no outbreaks of ND occurred during the study period. The ND La Sota modified live vaccine is immunogenic and efficacious and is a suitable vaccine for use in vaccination programmes in village chickens in the rural areas of Nepal.
Abbreviations
- EID50 :
-
Median egg infectious doses
- ELISA:
-
Enzyme-linked immunosorbent assay
- GMT:
-
Geometric mean titre
- HI:
-
Haemagglutination inhibition
- ICPI:
-
Intracerebral pathogenicity index
- IBDV:
-
Infectious bursal disease virus
- IB:
-
Infectious bronchitis
- NDV:
-
Newcastle disease virus
- ND:
-
Newcastle disease
- SPF:
-
Specific pathogen free
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Acknowledgments
We are grateful to the excellent assistance of Sharmila Dutta, Dr S.P Gautam, Ms K. Maharjan, Dr Sita Acharya, village animal health worker Krishna, Arjun, Radhika and the staff of CBPL for their help. We would like to thank Central Veterinary Laboratory, Tripureswor for providing the field virus. This is based on research funded in part by the Bill & Melinda Gates Foundation (Grant no. OPP1009497). The findings and conclusions contained within are those of the authors and do not necessarily reflect positions or policies of the Bill & Melinda Gates Foundation
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Ethical statement
All applicable international, national and/or institutional guidelines for the care and use of animals were followed. Blood sampling was carried out by veterinary surgeons and trained animal health workers. Participation in the study was on a voluntary basis, and the poultry keepers were informed about the purpose and methods of the study.
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An erratum to this article is available at http://dx.doi.org/10.1007/s11250-017-1260-5.
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Shrestha, S., Dhawan, M., Donadeu, M. et al. Efficacy of vaccination with La Sota strain vaccine to control Newcastle disease in village chickens in Nepal. Trop Anim Health Prod 49, 439–444 (2017). https://doi.org/10.1007/s11250-016-1205-4
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DOI: https://doi.org/10.1007/s11250-016-1205-4