The US has eased travel restrictions for many countries as the roll-out of Covid vaccines continues, but most UK passengers are still banned.
Some 61 countries have been lowered from the Level 4 "avoid all travel" rating.
France, Spain and Italy are now Level 3, which means fully-vaccinated passengers may go to to the US, but most passengers from the UK still cannot travel to the US.
The UK is listed as a Level 3 by the US Centres for Disease Control and Prevention (CDC).
However, under a presidential decree introduced last March, non-US citizens who have been in the UK in the last 14 days cannot enter the country unless a specific exemption applies.
Travellers from the US to the UK must self-isolate for 10 days on arrival as the country is on the "amber list”.
The US Centres for Disease Control and Prevention said that it had updated its criteria to "better differentiate countries with severe outbreak situations from countries with sustained, but controlled, Covid-19 spread."
The CDC said the new criteria for a Level 4 "avoid all travel" recommendation has changed from 100 cases per 100,000 to 500 cases per 100,000.
Other countries that saw their ratings lowered include Ecuador, Philippines, South Africa, Canada, Mexico, Russia and Switzerland.
Jordan, Denmark, Turkey, Ukraine, Honduras, Hungary also had their ratings lowered.
Japan also saw its travel rating lowered to allow vaccinated passengers to travel in the run-up to the Tokyo Olympics in July.
The CDC said it also expects more countries to get lower ratings in the coming weeks.
