After a large trial showed stronger protection, regulators are weighing whether Moderna’s mRNA vaccine could become a U.S.

As the U.S. flu season winds down, health officials say the flu vaccine didn't work very well, with one of its worst effectiveness rates in more than a decade. A new strain that dominated the early ...

The flu vaccine had one of its worst effectiveness rates in more than a decade this flu season, U.S. health officials say. A new strain that dominated the early winter was not well matched to the ...

NEW YORK (AP) — As the U.S. flu season winds down, health officials say the flu vaccine didn’t work very well, with one of its worst effectiveness rates in more than a decade. A new strain that ...