New rules requiring international air travellers arriving in the United States to obtain a negative Covid-19 test within one day of travel will take effect on Monday, US officials have confirmed.

The Centres for Disease Control and Prevention (CDC) said that beginning Monday “all air travellers, regardless of citizenship or vaccination status, will be required to show a negative pre-departure Covid-19 viral test taken the day before they board their flight to the United States.”

The CDC is expected to give airlines a three-day grace period to allow for some travellers to return to the United States with tests taken outside of the one-day window, according to a Reuters report.