Coronavirus in late pregnancy raises premature birth risk seven-fold

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Coronavirus in late pregnancy raises premature birth risk seven-fold
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Testing positive for the coronavirus in the last three months of pregnancy may double the risk of a premature birth, rising to a seven-fold increased risk if infected after 34 weeks

In a study of more than 5000 pregnant women, 9.1 per cent of those who had a positive covid-19 test after 34 weeks went on to give birth prematurely, defined as less than 37 weeks into the pregnancy. This is compared with 1.4 per cent of the women who didn’t test positive while pregnant. Trans men weren’t included in the study.

Throughout the pandemic, different studies have thrown up varying results when it comes to the risks related to having covid-19 during pregnancy. Some have linked the infection to a higher risk of preterm birth, but it was unclear at what point during pregnancy having covid-19 carried the highest risk.

During the first six months – about 27 weeks – of pregnancy, having covid-19 wasn’t linked with a rise in premature birth risk. But women who were infected in the last three months – week 28 onwards – were more than twice as likely to have a premature birth than those who didn’t test positive. Having covid-19 after week 34 was linked with a seven-fold increased risk, regardless of the severity of the infection. The researchers didn’t account for the women’s covid-19 vaccination status.

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