On Wednesday morning, two flights carrying passengers from Wuhan, China -- the epicenter of the Wuhan coronavirus outbreak -- arrived at Travis Air Force Base near Sacramento, California.

After refueling, one of these planes is now en route to Marine Corps Air Station Miramar in San Diego, California, and is expected to land shortly.

Later this week, two additional flights are scheduled to land in the United States, according to the US Centers for Disease Control and Prevention. One will arrive at Lackland Air Force Base in San Antonio, Texas the other at Eppley Airfield in Omaha, Nebraska.