Covid-19 Vaccines Temporarily Changed Menstrual Cycles, Study Shows

Nearly half of the participants of a recent study who were menstruating regularly at the time of the survey reported heavier bleeding during their periods after receiving the Covid-19 vaccine. Others who did not typically menstruate — including transgender men, people on long-acting contraceptives, and post-menopausal women — also experienced unusual bleeding. The new study…

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Vaccine protection waned this spring but boosters helped, the C.D.C. reports.

The emergence of highly contagious Omicron subvariants this spring in the United States appeared to reduce the protection offered by vaccines against Covid hospitalizations, scientists from the Centers for Disease Control and Prevention reported on Friday. But first and second booster shots helped to shore up people’s defenses, the agency found. The additional shots raised…

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