Abstract
We performed an anonymous seroprevalence survey of human immunodeficiency virus (HIV) type 1 infection through HIV antibody testing of blood samples from 22,512 women aged 15 to 44 years receiving prenatal care in British Columbia and the Yukon Territory from Mar. 15 to Sept. 30, 1989. Of the samples six were confirmed to be HIV positive; this yielded a crude overall seroprevalence rate of 2.7 per 10,000 pregnant women (95% confidence interval [CI] 1.0 to 5.8). All of the positive samples were from women 20 to 29 years of age; four were from Vancouver, one was from Victoria, and one was from elsewhere. The highest seroprevalence rates were among women aged 15 to 29 years in Vancouver and Victoria (7.2 and 9.4 per 10,000 pregnant women respectively). Thus, 1 in 1300 pregnant women in that age group in the metropolitan areas of British Columbia was HIV positive. Application of seroprevalence rates to the total female population in British Columbia and the Yukon Territory revealed that as many as 401 women had HIV infection in 1989. Our estimates likely represent the minimum. As a subset of women of childbearing age pregnant women are likely at lowest risk of HIV infection, and so the true number of women 15 to 44 years of age with HIV infection is probably several times higher. Our study has provided a baseline assessment and will be repeated annually to analyse trends in HIV seroprevalence among pregnant women in British Columbia and the Yukon Territory.
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