CDC issues strongest coronavirus warning yet The CDC has issued its strongest travel warning yet, urging Americans to avoid all non-essential travel to China, where more than 100 people have died after getting the coronavirus. The virus has infected more than 4,500 and spreads from person to person. Health officials are investigating more than 100 possible cases in the U.S. Dr. Jon LaPook explains the threat on "CBS This Morning’s” Morning Rounds.