mRNA vaccines have proven highly effective for COVID-19. But that doesn't mean they're ready to replace all others, experts explain.

After a mild flu season last year thanks to steps to prevent COVID's spread, experts worry it could come back bigger this year. Here's what to know.

A new inhaled vaccine offers protection against several strains of bacteria that can cause pneumonia in hospital settings, a study with mice shows.

Are COVID-19 booster shots ethical considering the number of people around the world who haven't even gotten a first vaccination?

If you never had any side effects from your Pfizer or Moderna COVID vaccine, don't worry. The vaccine still yields a robust antibody response.

The discovery that COVID-19 vaccination elicits a response in people with weakened immune systems, even if not quite as strong a response, is encouraging news.

HPV vaccines will yield significant reductions in throat and mouth cancers in the US, but not for about 25 years, a new study shows.

What is a vaccine booster shot? And why would you need one for COVID-19? An expert explains what you need to know about getting another jab.

After the FDA approval of the Pfizer/BioNtech COVID-19 vaccine, an expert explains what it means and why just the one vaccine's been approved.

People who survived SARS in 2003 and who got the Pfizer vaccine produce antibodies that can neutralize all known SARS-CoV-2 variants of concern, plus other animal coronaviruses.