Vaccine News & Notes — January 2023

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New CDC video describes how vaccine recommendations are made

In this new 5-minute video released by the Centers for Disease Control and Prevention (CDC), viewers can find out how vaccines recommendations are developed.

Watch the video.

Studies reveal average one-day change in menstrual cycle length following COVID-19 vaccination

As COVID-19 vaccines rolled out, women reported experiencing changes in their menstrual cycles. It was not immediately apparent why this would happen, but due to the concerns and anecdotes, scientists began to take a closer look.

To date, the studies have shown about a one-day lengthening in menstruation after receipt of the first or second dose of COVID-19 vaccine. If the two doses are administered during the same cycle, the length could increase to two days.

A few hypotheses regarding why this happens have been described, but more data will be needed. Find out more:

Other questions about COVID-19 or the vaccines? Don't forget about our dedicated page, We recently reviewed and updated the dozens of questions and answers. Don't see your question? Email us from the page.

"Vaccine-Preventable Disease: The Forgotten Story"

The Immunization Project at Texas Children’s Hospital offers a series of videos in which families share their personal stories of being affected by vaccine-preventable diseases, including COVID-19.

Check out the videos or learn more about The Immunization Project.

Materials in this section are updated as new information and vaccines become available. The Vaccine Education Center staff regularly reviews materials for accuracy.

You should not consider the information in this site to be specific, professional medical advice for your personal health or for your family's personal health. You should not use it to replace any relationship with a physician or other qualified healthcare professional. For medical concerns, including decisions about vaccinations, medications and other treatments, you should always consult your physician or, in serious cases, seek immediate assistance from emergency personnel.