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Objective(s)  This prospective observational cohort study aimed to evaluate whether women with severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2) infection during the first trimester of pregnancy are at higher risk of adverse obstetric and neonatal outcomes compared to negative patients.    Study Design  Seromolecular testing for SARS‐CoV‐2 was performed at 12, 16, 21 weeks, and at delivery; the cohort was then subdivided into a first‐trimester SARS‐CoV‐2‐positive (case) group and a SARS‐CoV‐2‐negative (control) group. The primary outcome was a composite adverse obstetric outcome, defined as the presence of either abortion, preterm delivery, preterm prelabor rupture of membranes, preeclampsia, intrauterine growth restriction, stillbirth; and a composite measure of adverse neonatal events, including either 1‐ and 5‐min Apgar score ≤ 7, neonatal intensive care unit admission and congenital birth defects. Maternal symptoms and antibody titer were secondarily assessed.    Results  A total of 17 of 164 women tested positive for SARS‐CoV‐2 (10.3%) in the first trimester. One SARS‐CoV‐2‐positive patient who gave birth at another hospital was excluded. Composite adverse obstetric outcome was observed in 6.2% (1/16) SARS‐CoV‐2‐positive and 10.5% (11/105) SARS‐CoV‐2‐negative women; composite adverse neonatal outcome in 12.5% (2/16) and 7.6% (8/105), respectively. In the newborns of women who had developed IgG antibodies, the same antibodies were detected in arterial cord blood and the nasopharyngeal swab tested negative for SARS‐CoV‐2.  No maternal pneumonia or hospital admission due to coronavirus disease‐19 were recorded.    Conclusion  Asymptomatic or mildly symptomatic women during the first trimester of pregnancy did not experience significantly more adverse events than SARS‐CoV‐2‐negative women.

Obstetric and neonatal outcomes after SARS‐CoV ‐2 infection in the first trimester of pregnancy: A prospective comparative study