CDC quarantines 350 Americans over coronavirus The CDC implemented its first public health quarantine in 50 years as 350 people are isolated over coronavirus fears. At least four American evacuees from Wuhan are now showing signs of sickness after landing in California on Wednesday. In Japan, two U.S. citizens have been diagnosed with coronavirus aboard a cruise ship, where 3,700 passengers are confined to their cabins for two weeks over health risks. Ramy Inocencio reports on the jump in confirmed cases.