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Analysis found it only protected healthy adults 60 percent of the time
http://www.nlm.nih.gov/medlineplus/news/fullstory_117946.html (*this news item will not be available after 01/23/2012)
Tuesday, October 25, 2011 
TUESDAY, Oct. 25 (HealthDay News) -- The most widely used flu vaccine in the United States is only about 60 percent effective in healthy adults, new research indicates.
That vaccine is the trivalent inactivated vaccine (TIV), which accounts for about 90 percent of flu shots in this country, according to a report in the Oct. 25 issue of The Lancet Infectious Diseases.
The less common live attenuated influenza vaccine (LAIV) is 83 percent protective in children aged 7 and younger, but it's not recommended for everyone in this age group.
The findings are in line with other recent reviews and don't mean that people shouldn't get their annual flu shot, said Dr. Joseph Bresee, chief of the epidemiology and prevention branch in the influenza division of the U.S. Centers for Disease Control and Prevention.