The requirement applies from January 5 and applies to everyone traveling from China, Hong Kong and Macau, he says.

The test must not be older than two days before departure and must be presented before the travelers leave China.

- All air travelers who are older than two years and traveling from China will have to show a negative test, says a source at the US Department of Health according to several US media.

Earlier on Wednesday, Italy announced that the country is introducing mandatory tests for all people who have traveled from China, even for those who are only stopping over in the country.