J Vet Sci.  2008 Sep;9(3):295-300. 10.4142/jvs.2008.9.3.295.

Protective efficacy of commercial inactivated Newcastle disease virus vaccines in chickens against a recent Korean epizootic strain

• Jeon WJ
• Lee EK
• Lee YJ
• Jeong OM
• Kim YJ
• Kwon JH
• Choi KS

• KMID: 1718583
• DOI: http://doi.org/10.4142/jvs.2008.9.3.295

Abstract

Despite the intensive vaccination policy that has been put in place to control Newcastle disease virus (NDV), the recent emergence of NDV genotype VII strains in Korea has led to significant economic losses in the poultry industry. We ssessed the ability of inactivated, oil-emulsion vaccines derived from La Sota or Ulster 2C NDV strains to protect chickens from challenge with Kr-005/00, which is a recently isolated Korean epizootic genotype VII strain. Six-week-old SPF chickens were vaccinated once and challenged three weeks later via the eye drop/intranasal route. All vaccinated birds were fully protected from disease, regardless of the vaccine strains used. All vaccinated and challenged groups showed significant sero-conversion 14 days after challenge. However, some vaccinated birds, despite being protected from disease, shed the challenge virus from their oro-pharynx and cloaca, albeit at significantly lower titers than the unvaccinated challenged control birds. The virological, serological, and epidemiological significance of our observations with regard to NDV disease eradication is discussed.

Keyword

Newcastle disease; protection; vaccination; virus shedding

MeSH Terms

Administration, Intranasal
Animals
Chickens
Cloaca/virology
Disease Outbreaks/prevention & control/*veterinary
Korea
Newcastle Disease/*immunology/prevention & control
Newcastle disease virus/*immunology
Ophthalmic Solutions
Poultry Diseases/*immunology/prevention & control
*Vaccines, Inactivated/administration & dosage
Viral Vaccines/*administration & dosage
Virus Shedding/drug effects

Figure

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  Fig. 1 Titers of Newcastle disease virus recovered from oro-pharyngeal and cloacal swabs after SPF chickens that had been vaccinated with La Sota- or Ulster 2C-derived vaccines were challenged with Kr-005/00 (A) or Kr-KJW/49 (B). OP; oropharyngeal swab, CL; cloacal swab.

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