The studies plan to establish if there is a correlation between irregular menstruation and the Pfizer, Moderna or Johnson & Johnson vaccines, and if so, why the change is occurring, according to Dr. Diana Bianchi, director of Eunice Kennedy Shriver National Institute of Child Health and Human Development, a branch of the NIH funding the study.
Reports of abnormal periods after COVID-19 vaccinations prompt NIH to award funding to study potential link

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