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Lyme disease threat in the U.S. has spiked 320 percent

Name: Lyme disease threat in the U.S. has spiked 320 percent
Uploaded: 2015-07-21T09:49:39-0400
Duration: 2 min 40 s
Description: The CDC says the high-risk area for lyme disease is spreading. CBS News medical contributor Dr. Holly Phillips joins CBSN with more on what's behind the surge.

The CDC says the high-risk area for lyme disease is spreading. CBS News medical contributor Dr. Holly Phillips joins CBSN with more on what's behind the surge.