COVID-19 vaccines lower the risk of getting sick, seriously ill or dying from the disease. But how do the different types of COVID-19 vaccines work? Each COVID-19 vaccine causes the immune system to ...

A higher dose of the flu vaccine may cut Alzheimer’s risk by more than half, research suggests. Image credit: alvarez/Getty Images For example, a study published in December 2025 found that the ...

With news of two highly effective COVID-19 vaccines on the horizon, health officials and scientists are giving us new insight into how we could gain herd immunity. "If we think of the population as a ...

New research comparing four different flu vaccines found that the ability of the vaccines to activate cells of the immune system that help to protect against infection varied greatly depending on the ...

Pasadena, CA - October 12: Tracy Gage, LVN, prepares a syringe at a flu and COVID vaccination clinic Kaiser Permanente Pasadena on Thursday, Oct. 12, 2023, in Pasadena, CA. (Francine Orr / Los Angeles ...

Vaccinations used to seem simple. Your doctor would tell you which to get, and you’d roll up your sleeve at the office or a nearby pharmacy. Now we’re seeing changing recommendations, and some people ...