The CDC recently approved new recommendations for the COVID vaccine, which differ from previous years' guidance.

The CDC updated its immunization schedule on Monday, dropping universal COVID vaccine recommendations and splitting up the MMRV shot.

Medical experts and vaccine maker Merck reject HHS Deputy Secretary Jim O'Neill's suggestion to split the MMR vaccine into individual measles, mumps and rubella shots.

A Washington Post-KFF poll finds that pediatricians are the most trusted source for vaccine information and that confidence in them is a strong predictor of vaccination.

While President Donald Trump is pushing to split the MMR vaccine into three shots, experts say there’s no scientific reason for it, and it could lead to lower vaccination rates.

A next-generation cancer vaccine has shown stunning results in mice, preventing up to 88% of aggressive and difficult-to-treat cancers by harnessing dual-pathway nanoparticles that train the immune system to recognize and destroy tumor cells.

The hepatitis B vaccine, discovered and developed in Philadelphia, was recently challenged by the Trump administration. Local advocates and patients are concerned for its future.

In the animal-based studies, a nanoparticle-based vaccine shrunk, cleared and prevented cancer growth, including melanoma.

A vaccine is a part of a virus that is used to build immunity and prevent the spread of disease. Here's five of the most important vaccines ever.