Researchers analyzed data on 7,530 pregnant women who received their first dose of Pfizer’s vaccine between Dec. 19 and Feb. 28 in Israel. The women were matched in a 1:1 ratio with 7,530 unvaccinated pregnant women by the following factors: age, gestational age, residential area, population subgroup, number of times they had given birth and flu vaccination status (which was used to indicate health-seeking behavior). They were observed until April 11.
The average age among all participants was 31.1.
Of the vaccinated women, 118 (1.6 percent) were infected with COVID-19 at least 28 days after receiving their first dose, compared to 202 (2.7 percent) of unvaccinated women.
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