This happens because of the injection itself and your body's immune response to the vaccine, which builds your body's immunity to the flu virus. Not everyone experiences soreness at the injection ...

A scientist surrounded by vials and beakers in a modern laboratory ... These include the company's next-generation COVID-19 ...

Whopping cough, or pertussis, cases this year have blown past pre-pandemic norms. New York is being hit especially hard. See why, how to stay safe.