A new study conducted by researchers from Oregon Health & Science University investigates whether seasonal influenza vaccines, alone or given alongside a COVID-19 vaccine, cause changes in menstrual cycle length. The findings point to small, temporary shifts, but no long-term effects were observed.

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3. A new study conducted by researchers from Oregon Health & Science University investigates whether seasonal influenza vaccines, alone or given alongside a COVID-19 vaccine, cause changes in menstrual cycle length. The findings point to small, temporary shifts, but no long-term effects were observed.