Effectiveness of mass oral cholera vaccination in Beira, Mozambique. by Lucas, M, Deen, J, von Seidlein, L, Wang, X, Ampuero, J, Puri, M, Ali, M, Ansaruzzaman, M, Amos, J, Macuamule, A, Cavailler, P, Guerin, P, Mahoudeau, C, Kahozi-Sangwa, P, Chaignat, C, Barreto, A, Songane, F, Clemens, J