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A mutant of Francisella tularensis strain SCHU S4 lacking the ability to express a 58-kilodalton protein is attenuated for virulence and is an effective live vaccine.
Twine S, Byström M, Chen W, Forsman M, Golovliov I, Johansson A, Kelly J, Lindgren H, Svensson K, Zingmark C, Conlan W, Sjöstedt A. Twine S, et al. Among authors: chen w. Infect Immun. 2005 Dec;73(12):8345-52. doi: 10.1128/IAI.73.12.8345-8352.2005. Infect Immun. 2005. PMID: 16299332 Free PMC article.
Correlates of protection following vaccination of mice with gene deletion mutants of Francisella tularensis subspecies tularensis strain, SCHU S4 that elicit varying degrees of immunity to systemic and respiratory challenge with wild-type bacteria.
Ryden P, Twine S, Shen H, Harris G, Chen W, Sjostedt A, Conlan W. Ryden P, et al. Among authors: chen w. Mol Immunol. 2013 May;54(1):58-67. doi: 10.1016/j.molimm.2012.10.043. Epub 2012 Nov 28. Mol Immunol. 2013. PMID: 23201853
Differential ability of novel attenuated targeted deletion mutants of Francisella tularensis subspecies tularensis strain SCHU S4 to protect mice against aerosol challenge with virulent bacteria: effects of host background and route of immunization.
Conlan JW, Shen H, Golovliov I, Zingmark C, Oyston PC, Chen W, House RV, Sjöstedt A. Conlan JW, et al. Among authors: chen w. Vaccine. 2010 Feb 17;28(7):1824-31. doi: 10.1016/j.vaccine.2009.12.001. Epub 2009 Dec 16. Vaccine. 2010. PMID: 20018266 Free PMC article.
BALB/c mice, but not C57BL/6 mice immunized with a ΔclpB mutant of Francisella tularensis subspecies tularensis are protected against respiratory challenge with wild-type bacteria: association of protection with post-vaccination and post-challenge immune responses.
Twine S, Shen H, Harris G, Chen W, Sjostedt A, Ryden P, Conlan W. Twine S, et al. Among authors: chen w. Vaccine. 2012 May 21;30(24):3634-45. doi: 10.1016/j.vaccine.2012.03.036. Epub 2012 Apr 3. Vaccine. 2012. PMID: 22484348
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