Half the Americans who test positive for Hepatitis C don't go back for follow-up testing, and that's not good.
The CDC says people who fail the Hepatitis C blood test need more detailed screening to see if they are still infected, because if they don't get the treatment they need, it can lead to serious problems, or even to liver cancer.
Since the CDC study also found two-thirds of cases were among baby boomers, new guidelines are encouraging physicians to test all their baby boomer patients for Hepatitis C.
The disease kills about 15,000 people every year.
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