As residents prepare to roll up their sleeves for a third, fourth or even fifth dose of COVID-19 vaccine, some may be wondering: Do I need to stick with the same brand, or is it safe to mix it up?

COVID-19 vaccines for some of the youngest children in the U.S. are now rolling out, and parents are faced with a new question: Moderna or Pfizer-BioNTech? Both of the mRNA shots—which are now ...

And they have two choices: One from Moderna and one from Pfizer and BioNTech. Both are mRNA vaccines that induce high levels of virus-fighting antibodies. Both reduce the risk of infection and of ...

There are three types of vaccines available in the United States — Pfizer-BioNTech, Moderna and Novavax. According to the CDC, there is no preference for one vaccine over the other. Wondering ...