This season's flu vaccine seems to be working pretty well, weakening the punch of a nasty bug that's going around, U.S. health officials said Thursday. Preliminary figures suggest the vaccine is 48 percent effective. That's not bad since the strain that's making most people sick is one of the worst. Experts consider it a good year when a flu vaccine is 50 to 60 percent effective. The flu vaccine is changed each year based on the best guess at which three or four strains will be the biggest problem for the next season. The current vaccine is a good match, and includes a strain of Type A H3N2 flu virus that is causing most illnesses. That wasn't the case with the vaccine two years ago when the same bug dominated and caused a very bad flu season. As of Feb. 10, the CDC shipped out 145 million doses of the flu vaccine. Flu shots are recommended for virtually all Americans age 6 months or older. Health officials were worried that fewer kids would get vaccinated this season after they stopped endorsing a popular nasal spray version. Research showed it didn't work well for another common type of flu. But vaccination rates for kids by November were about the same as the year before.
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