TOPSHOT - Passengers at the Los Angeles International Airport wear protective masks on January 22. Mark Ralston/AFP via Getty Images

The US Centers for Disease Control and Prevention (CDC) has screened more than 2,000 travelers to the US, about 200 flights, for Wuhan coronavirus as of Thursday.

It hasn't found any cases of the virus among those travelers, but one person was sent to the hospital for additional medical evaluation.

The CDC recently began health screenings for travelers from Wuhan at five airports: John F. Kennedy International Airport in New York, Los Angeles International Airport, San Francisco International Airport, Hartsfield-Jackson Atlanta International Airport and Chicago O'Hare International Airport.

On Friday, the CDC noted that both confirmed US patients were asymptomatic and fever-free when they arrived in the United States, although they arrived before airport screenings were in place.

As China has restricted travel for millions, the CDC is evaluating how to proceed with entry screenings.

“Those circumstances have clearly changed and so we are re-evaluating that approach,” Dr. Martin Cetron, director of the CDC's division of global migration and quarantine, said Friday.

This comes a day after the CDC raised its travel notice for Wuhan to its highest level, recommending "that travelers avoid all nonessential travel" to the central China city.