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Haapasalo M, Singh U, McBride BC, Uitto VJ.Haapasalo M, et al. Among authors: uitto vj.Infect Immun. 1991 Nov;59(11):4230-7. doi: 10.1128/iai.59.11.4230-4237.1991.Infect Immun. 1991.PMID: 1937780Free PMC article.