Cells gathered during a Pap test. Those on the left are normal, and those on the right are infected with human papillomavirus.
Ed Uthman/Wikimedia Commons
March 14, 2012 For years, doctors have recommended that women start getting Pap smears every year or two to try to catch signs of cancer early, when it's easiest to prevent and treat. But new guidelines say that testing every three years is a better idea for most women.
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