Can genotype mismatch really affect the level of protection conferred by Newcastle disease vaccines against heterologous virulent strains?

Haijin Liu, Renata Servan de Almeida, Patricia Gil, Natàlia Majó, Miquel Nofrarías, François Xavier Briand, Véronique Jestin, Emmanuel Albina

Research output: Contribution to journalArticleResearchpeer-review

6 Citations (Scopus)

Abstract

© 2018 Elsevier Ltd Newcastle disease (ND), caused by virulent class II avian paramyxovirus 1 (Newcastle disease virus, NDV), occurs sporadically in poultry despite their having been immunized with commercial vaccines. These vaccines were all derived from NDV strains isolated around 70 years ago. Since then, class II NDV strains have evolved into 18 genotypes. Whether the vaccination failure results from genotype mismatches between the currently used vaccine strains and field-circulating velogenic strains or from an impaired immune response in the vaccination remains unclear. To test the first hypothesis, we performed a heterologous genotype II vaccine/genotype XI challenge in one-day old specific pathogen free (SPF) chicks and reproduced viral shedding. We then produced two attenuated strains of genotype II and XI by reverse genetics and used them to immunize two-week old SPF chickens that were subsequently challenged with velogenic strains of genotypes II, VII and XI. We found that both vaccines could induce antibodies with hemagglutination inhibition titers higher than 6.5 log2. Vaccination also completely prevented disease, viral shedding in swabs, and blocked viral replication in tissues from different genotypes in contrast to unvaccinated chickens that died shortly after challenge. Taken together, our results support the hypothesis that, in immunocompetent poultry, genotype mismatch is not the main reason for vaccination failure.
Original languageEnglish
Pages (from-to)3917-3925
JournalVaccine
Volume36
Issue number27
DOIs
Publication statusPublished - 22 Jun 2018

Keywords

  • Genotype mismatch
  • Newcastle disease
  • Protection
  • Vaccine
  • Viral shedding

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