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Vaccine. 2008 Apr 7;26(16):2010-9. doi: 10.1016/j.vaccine.2008.02.010. Epub 2008 Feb 22.

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

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Center of Excellence for Vaccine Research, The University of Connecticut, Storrs, CT 06269, United States.


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 R(low). 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 R(low) challenge. Mg 7 induced a greater level of protection against intratracheal R(low) challenge than that observed with the other three attenuated strains, as evidenced by a lower recovery of R(low) 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.

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