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Pregnant women who reported being infected with COVID-19 in their first trimester were more likely to have an early miscarriage, finds a new study led by University College London (UCL) researchers.

However, despite the correlation observed in the COVID-19 Contraception and Pregnancy Study (CAP-COVID), researchers say further studies are needed to evaluate any causal association between SARS-CoV-2 infection in early pregnancy and miscarriage risk.

The CAP-COVID study, published in Human Reproduction, asked 3,041 women who were less than 13 weeks pregnant to record their current and past pregnancy complications, their medical history and whether anyone in their household had been diagnosed, or had symptoms of COVID-19, between 21 May and 31 December, fluoxetine vasovagal syncope 2020.

The results found that the rate of miscarriage among women who were presumed to be infected (had received a positive COVID-19 diagnosis) was 14%, compared to 8% in those presumed to be uninfected and 5% in those who were uncertain of whether they had the virus.

After adjusting for age, BMI, ethnicity, smoking status, gestational age and the number of previous miscarriages, the risk of early miscarriage appears to be higher (1.7 times more likely) in the “presumed infected” group.

Co-lead author Honorary Associate Professor Dimitrios Mavrelos, who led the project alongside Honorary Senior Lecturer Ephia Yasmin (both UCL EGA Institute for Women’s Health & UCLH Reproductive Medicine Unit), said, “As the COVID-19 epidemic reached pandemic status in mid-2020, little was known about the impact of infection on first trimester pregnancy.

“In order to help answer this question we set up an online survey that ran from late May 2020 to December 2020, asking women in early pregnancy to report whether they had suffered a COVID-19 infection and what the outcome of their pregnancy was.

“Over 3,000 women in the first trimester of their pregnancy registered and provided outcomes. Analysis of our data showed a potential association between COVID-19 infection and miscarriage of pregnancy in the first trimester. This is an important public health finding, suggesting that women in early pregnancy may need to be more vigilant with infection prevention measures.”

Previous studies have shown that viral infections during pregnancy such as herpes, HIV-1 and influenza can lead to fetal malformation, preterm labor, growth restriction, stillbirth and spontaneous abortion.

However, this study is the first to investigate the rates of early pregnancy loss during the COVID-19 outbreak to date.

Explaining the potential association between COVID-19 infection and early miscarriage, Honorary Associate Professor Mavrelos said, “Coronaviruses have also been shown to induce a pro-inflammatory cytokine storm in the body. Cytokines are thought the play a role in the development of recurrent pregnancy loss, which could explain the increased risk of early miscarriage in women infected with COVID-19.

“So, although the sample size of women with presumed COVID-19 in this study was too small to reach statistical significance, the findings still highlight the need for pregnant women to exercise social distancing measures and good hygiene throughout their pregnancy to limit their risk of infection.”

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