Investigations into the safety and immunogenicity of a killed oral cholera vaccine developed in Viet Nam by Trach D.D, Cam P.D, Ke N.T, Rao M.R, Dinh D., Hang P.V, Hung N.V, Canh D.G, Thiem V.D, Naficy A., Ivanoff B., Svennerholm A-M, Holmgren J., Clemens J.D

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