Conclusion There was a significant trend between rubella seronegativity with age in young gravidae, but the pattern was opposite between gravidae born after versus in/before 1983, with the former having a higher incidence of seronegativity at all ages.
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Impact of the two-dose rubella vaccination regimen on incidence of rubella seronegativity in gravidae aged 25 years and younger.
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The sentences
In fact, the higher incidence of rubella seronegativity was found consistently across the entire group from those aged ≤16 years up to aged 25 years, although the difference in the youngest group (≤16 years) did not reach statistical significance owing to the small number of gravidae.