Vaccines

Learn about the common and rare side effects of the tetanus shot. This article also looks at how long reactions can last, when to contact a doctor, and more.

After months of booster vaccine safety and efficacy trials and research, the CDC is recommending a booster shot of the Pfizer vaccine for people at increased risk of COVID-19. The CDC recommends an additional dose of either the Pfizer or Modern vaccine for immunocompromised people--who are unlikely to have generated strong immunity from the first two shots of vaccine. Learn more about COVID-19 vaccine booster shots, including who's eligible for a COVID-19 vaccine booster.

With three COVID-19 vaccines authorized for use in the United States, people are asking if one vaccine is better than another, if it matters which COVID-19 vaccine you get, or if you’ll have a choice. Find out about vaccine effectiveness, two-dose vs. one-dose vaccines, side effects, and more.

With the COVID-19 vaccination program underway, many people have questions about the vaccines. Learn more about the COVID-19 vaccines and vaccination, including side effects, how long immunity might last, and more.