| preparations for aids vaccine evaluations. rate of new hiv infection in a cohort of women of childbearing age in malawi. | women attending the queen elizabeth central hospital in blantyre, malawi, between november 1989 and october 1993 were studied as part of a longitudinal cohort study of mother-to-infant hiv transmission. 694 hiv-seropositive and 687 hiv-seronegative women were enrolled at delivery. in the follow-up phase, women attended the clinic every 3 months for the first 24 months and every 6 months thereafter, where they were administered a questionnaire and underwent pelvic exam for the diagnosis of sexual ... | 1994 | 7865310 |