Efficacy trial of Vi polysaccharide vaccine against typhoid fever in south-western China by Yang H.H, Wu C.G, Xie G.Z, Gu Q.W, Wang B.R, Wang L.Y, Wang H.F, Ding Z.S, Yang Y., Tan W.S, Wang W.Y, Wang X.C, Qin M., Wang J.H, Tang H.A, Jiang X.M, Li Y.H, Wang M.L, Zhang S.L, Li G.L

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