Dr. Sanjay Gupta Explains The Zika Virus

The Centers for Disease Control and Prevention on Wednesday updated its Zika virus guidance for pregnant women, after a case originated in Texas. They are advising them to protect themselves if their male sexual partner has traveled to or lives in an area where Zika virus is circulating. How worried show we be about Zika? CNN’s Chief Medical Correspondent Dr. Sanjay Gupta joined John with expert analysis.