Starting today a negative COVID test or proof of recovery from the virus will be required for all air travelers arriving in the U.S.
This comes after a new variant of the virus from Brazil turned up in Minnesota.
The CDC says this variant doesn't spread as quickly as the ones in the U.K. or South Africa but its even harder to fight.
And yesterday, health officials announced the first known case of the U.K. variant of the virus was found in Nevada.
It was detected from a symptomatic woman in her 30's who lives in Las Vegas.