Updated in 2020 by Web M.D.

-“This year’s flu vaccine has been 45% effective against the flu so far this season, new CDC figures show.

-It worked better against the B strain of the flu (50% effective) than the A strain (37% effective.) And overall it worked better in children and teens ages 6 months to 17, with a 55% effectiveness rate.

-The effectiveness rate for vaccines typically ranges from 40% to 60%, the CDC says, and the vaccine can help prevent illness, hospitalization and death.

-The news come as flu activity remains high.

-After increasing for several weeks, the number of cases descreased slightly, the CDC says.

-An A strain of flu remains more common now. Earlier in the season, a B strain was more common.”

WebM.D.