As of February 2, US citizens returning home who have been in the Hubei province within the past 14 days can be quarantined for up to two weeks.
On January 29, a flight carrying nearly 200 Americans from Wuhan landed at the March Air Reserve Base in Riverside, California. The passengers have been placed under a 14-day quarantine in the base's living quarters.
On Wednesday, another set of roughly 350 evacuees arrived in the US. They are being quarantined at two California military bases: the Travis Air Force Base in Fairfield and the Miramar Marine Corps Air Station in San Diego.
Of the 167 passengers who landed in San Diego, four were transported to local hospitals after showing symptoms of the virus, the CDC said.
A flight carrying additional passengers from Wuhan took off on Wednesday, headed for the Lackland Air Force Base in San Antonio, Texas. A fourth flight will carry evacuees to the Eppley Airfield in Omaha, Nebraska.