The COVID-19 booster was linked to shorter menstrual cycles in adolescent girls in the 4 months following administration, particularly when teens were in their follicular phase. The vaccine did not ...

The CDC is encouraging Americans traveling abroad to make sure they are up to date on their polio vaccines ...

The Centers for Disease Control and Prevention is issuing new advice for people who are immunocompromised. The health organization said people who've had the MRNA vaccines should look to get a fourth ...

Health experts are reinforcing the point that full vaccination remains highly effective against severe illness and death caused by COVID-19 as federal regulators consider the possibility of ...

According to a study of more than 5.5 million adults aged 50 years or older, vaccination with the bivalent BA.1 mRNA booster ...

Discussions around whether a COVID-19 vaccine booster is necessary can have seemingly conflicting information. “It’s complicated. This is not just a simple equation,” Dr. Michelle Barron, senior ...

Polio is not endemic in the United States, but the disease is circulating in 30 other countries now. A doctor explains how to protect against polio when traveling.

SAN FRANCISCO -- Moderna announced people may need a second booster to increase protection. But is a fourth shot the right approach? ABC7 News reporter Luz Pena from San Francisco spoke to multiple ...