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Shivachandra SB, Li Q, Peachman KK, Matyas GR, Leppla SH, Alving CR, Rao M, Rao VB.Shivachandra SB, et al. Among authors: rao m, rao vb.Vaccine. 2007 Jan 26;25(7):1225-35. doi: 10.1016/j.vaccine.2006.10.010. Epub 2006 Oct 17.Vaccine. 2007.PMID: 17069938Free PMC article.