Pfizer’s COVID-19 vaccine is 78% effective during pregnancy, study shows

The full two-dose regimen of Pfizer’s COVID-19 vaccine was 78 percent effective in preventing infection among pregnant women, according to a real-world Israeli study published July 12 in JAMA.

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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.

Access the full study here.

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