Comparative assessment of a metabolically attenuated Mycoplasma gallisepticum mutant as a live vaccine for the prevention of avian respiratory mycoplasmosis

A. E. Gates, S. Frasca, Carol A Nyaoke, T. S. Gorton, L. K. Silbart, S. J. Geary

Research output: Contribution to journalArticle

23 Scopus citations

Abstract

In a previous study, signature sequence mutagenesis (SSM) was used to identify a mutant with a disruption of the gene encoding the metabolic factor, dihydrolipoamide dehydrogenase, and that mutant was designated Mg 7. The current study assessed the safety, immunogenicity and efficacy of Mg 7 in comparison to two commercially available vaccines (ts-11 and F) as well as a laboratory vaccine strain, GT5. Intratracheal vaccination of chickens with all four attenuated mutants induced varying levels of protection against intratracheal challenge with virulent Mycoplasma gallisepticum strain Rlow. Mg 7 vaccinated chickens rapidly cleared the challenge strain, had lower histopathologic tracheal lesion scores when compared to unvaccinated chickens, and mounted a strong humoral anti-M. gallisepticum-specific IgG response. The IgG levels increased 2- to 3-fold upon Rlow challenge. Mg 7 induced a greater level of protection against intratracheal Rlow challenge than that observed with the other three attenuated strains, as evidenced by a lower recovery of Rlow from tracheas and lower histopathologic lesion scores in tracheas and air sacs. Based on these findings, Mg 7 appears to have good potential as a safe and effective vaccine for the prevention of avian mycoplasmosis.

Original languageEnglish (US)
Pages (from-to)2010-2019
Number of pages10
JournalVaccine
Volume26
Issue number16
DOIs
StatePublished - Apr 7 2008
Externally publishedYes

Keywords

  • Mycoplasma gallisepticum
  • Respiratory disease
  • Vaccine

ASJC Scopus subject areas

  • Immunology
  • Microbiology
  • Virology
  • Infectious Diseases
  • Public Health, Environmental and Occupational Health
  • veterinary(all)

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