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Goytia M, Shafer WM.Goytia M, et al. Among authors: shafer wm.Infect Immun. 2010 Jul;78(7):3187-95. doi: 10.1128/IAI.01301-09. Epub 2010 May 3.Infect Immun. 2010.PMID: 20439477Free PMC article.