Changing epidemiology of human parvovirus 4 infection in sub-Saharan Africa. by Sharp, C, Vermeulen, M, Nébié, Y, Djoko, C, LeBreton, M, Tamoufe, U, Rimoin, A, Kayembe, P, Carr, J, Servant-Delmas, A, Laperche, S, Harrison, G, Pybus, O, Delwart, E, Wolfe, N, Saville, A, Lefrère, J, Simmonds, P