Flu vaccine not working well; only 23 percent effective

NEW YORK (AP) -- As predicted, this year's flu vaccine is doing a pretty crummy job. Health officials say a new study shows it's only 23 percent effective.<br /> <br /> That's one of the worst performances since the government started tracking how well vaccines work a decade ago. The best flu vaccines were 50 to 60 percent effective.<br /> <br /> But this year, the vaccine doesn't include the specific virus that is making most people sick. Early in the season, officials warned the vaccine probably would not work very well.<br /> <br /> The study results were released Thursday by the Centers for Disease Control and Prevention. They studied about 2,300 people in five states who were sick.