On average, delays to vaccinated individuals’ periods were within the normal range—up to eight days. So for most, vaccines did not have a medically concerning impact on their menstrual cycles
Save time by listening to our audio articles as you multitaskWhen women of reproductive age started to be vaccinated in large numbers in the summer of 2021, some noticed that their periods following vaccination were later than normal. By September of that year, there were more than 30,000 reports to Britain’s medicines regulator alone of late periods following covid vaccines . Anti-vaxxers then used this phenomenon to scare women with speculations about long-term damage to their fertility.
Dr Edelman’s study analysed data provided by 19,622 app-users from around the world, though most lived in Europe or North America. A quarter of them, who acted as controls, were unvaccinated. The vaccinated participants had received a variety of types of vaccine . Vaccine type made no difference to the result.
On average, delays to vaccinated individuals’ periods were within the normal range—up to eight days. So for most, vaccines did not have a medically concerning impact. However, the researchers found that 6.2% of vaccinated participants’ periods immediately after receiving a dose of a vaccine were more than eight days late. Those experiencing these abnormally late periods in the post-vaccine cycle tended already to have longer cycles.
At the moment, to limit the risk of miscarriage and harm to fetuses during a vaccine trial, it is standard practice for women of reproductive age participating in such trials to be using birth control. That is a sensible precaution, as was the decision to not include pregnant women in specific formal clinical trials.
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