CBS News chief medical correspondent Dr. Jon LaPook joins "CBS This Morning" to discuss the growing severity of the threat
Top U.S. health officials are growing more concerned about the spread of the Zika virus. Thirty states are projected to get the type of mosquito that spreads the virus by summer, up from an earlier estimate of 12. CBS News chief medical correspondent Dr. Jon LaPook joins "CBS This Morning" to discuss the growing severity of the threat.
