UPDATED 13:48 PM EST, February 21, 2013
ATLANTA (AP) — Health officials say this season's flu shot is only 9 percent effective in protecting seniors against the most common and dangerous flu bug.
Flu vaccine tends to protect younger people better than older ones and is never 100 percent effective. But experts say the preliminary results released Thursday are disappointing and highlight the need for a better vaccine.
For all age groups, the vaccine's effectiveness was a moderate 56 percent.
