According to a new study published in the journal Obstetrics & Genecology , women who received the coronavirus vaccine experienced a menstrual cycle nearly a day longer than usual.
A team of scientists led by Oregon Health and Science University analyzed the cycles of nearly 4,000 women through a fertility-tracking app; some were vaccinated and others were not.
The result was that the average increase in menstrual cycles after the first dose of vaccine was 0.64 days (approximately 15.36 hours) and 0.79 days (approximately 18.96 hours) after the second dose. However, a subgroup of app users who received two doses of the vaccine in the same menstrual cycle (358 users) had an average increase of two more days.
Menstrual cycles generally last about 28 days, but the exact number varies from woman to woman , during periods of stress, as well as throughout a woman’s life.
The results of the investigation are preliminary, since this study has a duration of twelve months; is funded by the National Institutes of Health (NIH) and involves five universities that aim to determine whether or not there is a link between having abnormal periods and the COVID-19 vaccine.
Of the 3,959 women participating in the study, 2,403 were vaccinated (with Pfizer, Moderna, and the Johnson & Johnson vaccine) and 1,556 were unvaccinated.
Referencia:
Association Between Menstrual Cycle Length and Coronavirus Disease 2019 (COVID-19) Vaccination
A U.S. Cohort
Edelman, Alison MD, MPH; Boniface, Emily R. MPH; Benhar, Eleonora PhD; Han, Leo MD, MPH; Matteson, Kristen A. MD, MPH; Favaro, Carlotta PhD; Pearson, Jack T. PhD; Darney, Blair G. PhD, MPHObstetrics & Gynecology: January 5, 2022 – Volume – Issue – 10.1097/AOG.0000000000004695
doi: 10.1097/AOG.0000000000004695
