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Flu Shot May Not Work as Well for Seniors
Date:2/6/2013

By Amy Norton
HealthDay Reporter

WEDNESDAY, Feb. 6 (HealthDay News) -- Seniors seem to get a weaker boost to their immune system following a flu shot than young people do, a small study shows.

Experts say the findings essentially confirm what's been believed: The flu shot just doesn't work as well for older immune systems. But they also caution that the vaccine remains the best defense against flu misery.

Older people are among those at greatest risk for flu complications, like pneumonia. Americans older than 65 have been hard-hit during the current, rough flu season: Late last month, the U.S. Centers for Disease Control and Prevention said that 98 of every 100,000 seniors were hospitalized with the flu for the week ending Jan. 19.

So older adults should keep getting vaccinated every year, according to Nicholas Kelley, a research associate with the Center for Infectious Disease Research and Policy at the University of Minnesota, in Minneapolis.

"Getting the flu shot is safe, and it's better than doing nothing," said Kelley, who was not involved in the new study. "It's still the best weapon we've got."

For the study, which appeared Feb. 6 in the journal Science Translational Medicine, researchers analyzed blood samples from 17 volunteers who'd gotten the flu shot. Four of them were aged 70 or older, while the rest were 8 to 30 years old.

They used gene-sequencing technology to get a "head count" of immune system cells called B cells during the volunteers' peak immune response to the vaccine, explained lead researcher Ning Jenny Jiang, currently an assistant professor at the University of Texas at Austin. The study took place while she was based at Stanford University.

B cells are important because they produce the antibodies that the immune system launches against invaders, like the flu virus. When B cells are exposed to the dead or weakened virus in a vaccine, they "tweak" their a
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