Study: Higher Miscarriage Rates for COVID-19 Vaccinated Women

Simian Practicalist
Jul 13
2 min read

A Spanish study by N. Rodríguez-Blanco et al titled “The impact of SARS-CoV-2 infection on vaccinated versus unvaccinated pregnant women: a retrospective cohort study” posted on 30 April 2025 seemingly speaks well of the effects of the COVID-19 vaccines… except for a couple of key details.

The paper is 13 pages long with the main text at about 10 pages. The remaining are references.

The study sample was small, with 156 women in total who gave birth after being infected with SARS-CoV-2 during their pregnancy. The data was taken from two hospitals in Alicante, Spain, from 1 March 2020 to 31 March 2022.

Of the 156 women, 45 received at least one dose of the COVID-19 vaccine and 111 women did not receive any dose of the COVID-19 vaccine.

Generally, vaccinated women reported less severe symptoms than unvaccinated women. See Figure 1 reproduced below.

Figure 1: Comparison of symptomatology associated with SARS-CoV-2 infection between vaccinated and unvaccinated pregnant women.

Regarding newborn characteristics such as complications of labour and delivery, 1- and 5-minute Apgar scores, and postpartum complications, there were no significant differences between the vaccinated and unvaccinated. Of course, none of this conveniently reveals anything about the long-term effects of the so-called vaccine.

But the key takeaway is that 5 of the 45 (11.1%) vaccinated women had miscarriages compared to 5 of the 111 (4.5%) unvaccinated women. For both groups, the risk of miscarriage is higher if infected during the first or second trimester.

This is not surprising considering a recent pre-print study that included over 226,000 records.

Be sure to subscribe to our mailing list so you get each new Opinyun that comes out!