WASHINGTON, Jan 7 — Women vaccinated against Covid-19 saw a slight delay in their period of almost a day compared to those who were unvaccinated, a US government-funded study said Thursday. But the number of days of bleeding was not affected, according to the research carried out on nearly 4,000...
WASHINGTON, Jan 7 — Women vaccinated against Covid-19 saw a slight delay in their period of almost a day compared to those who were unvaccinated, a US government-funded study said Thursday.
The slight increase in menstrual cycle length is not clinically significant. Any change of fewer than eight days is classified as normal by the International Federation of Gynecology and Obstetrics. Some 2,400 participants were vaccinated — the majority with Pfizer , followed by Moderna and Johnson & Johnson .Among the vaccinated group, data was collected from three consecutive cycles before vaccination and from three more consecutive cycles, including the cycle or cycles in which vaccination took place.Immune response to vaccine
Specifically, the production of inflammatory proteins called cytokines appears to disrupt the way this axis regulates the timing of menstrual cycles.
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