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Flu concerns for the upcoming season
Health officials warning Americans this week to prepare for the flu season.
It's a yearly threat, sending thousand Americans to the hospital every year.
But this year, there's some good news.
The CDC says Americans did better than ever during last winter's flu season -- with 57-percent of children getting vaccinations.
And there are new shots available that protect against four different flu strains.
Scientists are even working on a universal flu shot that would protect against all strains that may be available in a few years.