1. Influenza vaccination may lead to temporary changes in menstrual cycle length, especially during the follicular phase.
2. Combined influenza and COVID-19 vaccination also showed similar effects on menstrual cycle length.
3. The changes were temporary and participants returned to their typical menstrual cycle lengths in the cycle following vaccination.
4. Researchers suggested using the study findings to counsel patients about potential menstrual cycle disturbances following vaccination.
5. Timing vaccination to coincide with the luteal phase was recommended to address vaccine hesitancy.
6. The study highlighted the importance of understanding and addressing the impact of vaccines on menstrual cyclicity. 

Source: JAMA Network Open