Peer-Reviewed Czech Study: COVID Vaccinated Women 33% Less Likely to Successfully Conceive

At least from June 2021, monthly numbers of successful conceptions per 1,000 women were considerably lower for women vaccinated before conception, compared to those who were not,” the study reports.

By the end of 2021, around 70% of Czech women of reproductive age had received the vaccine, primarily the mRNA-based Pfizer and Moderna shots. However, the study reveals that conception rates among this majority were markedly lower than expected based on their share of the population.

Meanwhile, unvaccinated women maintained higher and more stable rates of conception, especially during the latter half of 2021 and into 2022. At one point, unvaccinated women were conceiving at a rate 1.5 times higher than vaccinated women.

While Big Pharma vaccine makers and government regulators continue to downplay such concerns, this peer-reviewed analysis of real-world data suggests there may indeed be a connection between the shots and reduced ability to conceive.

Though the authors caution that the results are “hypothesis-generating and preliminary,” the implications are serious. Unlike anecdotal reports or small-scale surveys, this study is grounded in national health registry data and spans a large population.

“These results call for further studies of the potential influence of COVID-19 vaccination on human fecundability and fertility,” the authors write.

This isn’t the first red flag. From the early days of the vaccine rollout, thousands of women reported menstrual changes— longer cycles, heavier bleeding, and disruptions in timing. These concerns were initially dismissed, only to be later acknowledged by researchers as legitimate.

Now, with evidence that conception itself may be affected, critics are questioning how such critical aspects of reproductive health were overlooked in pre-authorization trials. The original studies conducted by vaccine manufacturers did not examine fertility or menstrual health in any meaningful way.

This groundbreaking Czech study, backed by peer-reviewed data and published in a reputable medical journal, may mark a turning point in the global discussion on vaccine safety. For millions of women, the most basic question — “Will this affect my ability to have children?” — may finally start receiving the honest scrutiny it deserves.