According to a recent American study, vaccination against corona can be slightly delayed menstruation In women, according to the study published in one of the international journals, the menstrual cycle begins about a day later in vaccinated women compared to non-vaccinated women, however, the duration of the menstrual cycle was not affected.
According to the German website, “T Online”, according to the researchers, the effect of vaccination on the menstrual cycle is small and likely temporary.
The scientists evaluated data from an app used to monitor fertility in women aged 18 to 45 who were not using hormonal contraception, and about 2,400 of them had been vaccinated, most of whom had the Biontech/Pfizer vaccine (55%), followed by Moderna ( 35%), then Johnson & Johnson (7%). Data from 1,500 unvaccinated women were used for comparison.
The researchers compared data from three consecutive menstrual cycles, three before vaccination and three after vaccination. For unvaccinated women, there were an average of six consecutive menstrual cycles. The first vaccine dose was associated with an increase in cycle length of 0.64 days and the second dose with an increase of 0.79 days.
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