Impact of antenatal HIV screening to prevent HIV infection in children in Norway 1987-99.
OBJECTIVE
To assess the impact of the antenatal HIV screening programme in Norway in preventing HIV infection in children.


METHODS
Norway, 1987-99.


METHODS
In a simulated retrospective cohort design data were used from the mandatory HIV surveillance system to compare the observed number of children born infected with HIV in Norway 1987-99 to the expected number without the antenatal screening programme. The main measures were relative and absolute performance of the screening programme. Other measures were uptake and false positive rate of screening, and number and exposure category of screen positive women.


RESULTS
96% of 961 000 eligible pregnant women were tested. 0.1% had an indeterminate test result and 46 women (5.0/100 000) were confirmed screen positive. 27 were African or south east Asian women infected before immigration to Norway. Nine out of 739 000 live born children (1.2/100 000) were infected compared with the expected 18 with no screening. The absolute impact of the screening programme was 1.3 (95% confidence interval (95% CI) -0.1 to 2.7) prevented infections in 100 000 women screened. The relative preventive impact was 51% (-15% to 81%).


CONCLUSIONS
The limited absolute impact is because of the very low prevalence of undetected HIV infection among pregnant women in Norway.
Norwegian Institute of Public Health, PO Box 4404, Nydalen, 0403 Oslo, Norway. preben.aavitsland@fhi.no
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Aavitsland
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Nilsen
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Lystad
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Bjørndal
D015492:AIDS Serodiagnosis / Q000706:statistics & numerical data; D000349:Africa / Q000208:ethnology; D001210:Asia, Southeastern / Q000208:ethnology; D015331:Cohort Studies; D005260:Female; D015658:HIV Infections / Q000175:diagnosis / Q000517:prevention & control* / Q000635:transmission; D006801:Humans; D007231:Infant, Newborn; D018445:Infectious Disease Transmission, Vertical / Q000517:prevention & control*; D008403:Mass Screening / Q000706:statistics & numerical data; D009664:Norway / Q000453:epidemiology; D017063:Outcome Assessment, Health Care; D011247:Pregnancy; D011251:Pregnancy Complications, Infectious / Q000175:diagnosis*; D011295:Prenatal Care; D015995:Prevalence; D015397:Program Evaluation; D012189:Retrospective Studies