Seroepidemiology of Rickettsia typhi spotted fever group, rickettsiae and Coxiella buretii infection in pregnant from urban Tanzania - Anstey,N.M.; Tissot-Dupont,H.; Hahn,C.G.; Mwaikamlo,E.D.; Mc Donald,M.; Raoult,D.; Sexton,D.J. (Am J Trop Med Hyg, 1997)