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(CNN) -
The Bahamas and Morocco are now among the highest risk destinations for travelers, according to the regularly revised list of travel advisories from the US Centers for Disease Control and Prevention, CDC.
People should avoid traveling to places designated with the "Level 4: Covid-19 Very High" advisory, the CDC recommends.
Anyone who must travel should be fully vaccinated first, the agency cautions.
Six destinations made the Tier 4 list on August 23:
Bahamas
Haiti
Kosovo
Lebanon
Morocco
San Martin
Travel benefits and restrictions, according to the type of vaccine against covid-19
This photo shows Old Bahama Bay West End.
Travel risk levels
CDC's evolving list of travel advisories ranges from Level 1 ("low") to Level 4 ("very high").
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Destinations that fall into the level 4 category - "very high covid-19" - have had more than 500 cases per 100,000 inhabitants in the last 28 days, according to CDC criteria.
The Level 3 category is applied to destinations that have had between 100 and 500 cases per 100,000 residents in the last 28 days.
The six destinations newly added to Tier 4 were previously classified as 'Tier 3: covid-19 high'.
The Prime Minister of the Bahamas implemented a curfew due to the pandemic this Saturday, August 21, from 8 pm to 5 am in Exuma, Abaco and the Abaco Cays, and in the north, center and south of Andros.
Amid the aftermath of the 7.2 magnitude earthquake that struck southwestern Haiti on August 14, the country's prime minister reminded citizens to be aware of the risk of COVID-19 contagion during recovery efforts.
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New "Tier 3" destinations
Another ten destinations were moved to the category "Level 3: covid-19 high" this Monday.
Albania, Bosnia, Herzegovina, Brunei and Liechtenstein passed the first level.
Bulgaria and Serbia moved from level two.
Greenland and Guernsey changed "level unknown".
And Paraguay dropped from level four.
CDC's guide to Level 3 destinations urges unvaccinated travelers to avoid nonessential travel to those locations.
In its broader travel guide, the CDC has recommended avoiding all international travel until fully vaccinated.
"Fully vaccinated travelers are less likely to contract and spread COVID-19. However, international travel presents additional risks, and even fully vaccinated travelers may be at higher risk of contracting and possibly spreading some variants of COVID-19." the agency said.
You can see the CDC risk level for any destination on their travel advice page.
Covid-19 Travel restriction
