¹From the Departments of Obstetrics and Gyne-cology, The Chicago Medical School and MountSinai Hospital; the Department of Bacteriology,Mount Sinai Hospital and The Mount Sinai Medi-cnl Research Foundation of Chicago, Chicago,Illinois

*Associate Professor of Obstetrics, The Chicago Medical School; Associate Obstetrician and Gynecologist, Mount Sinai Hospital of Chicago

†Bacteriologist, Mount Sinai Hospital of Chicago and Mount Sinai Medical Research Foundation