(CNN) – The Bahamas and Morocco are now among the most dangerous destinations for travelers, According to the travel advice list Periodic review by the US Centers for Disease Control and Prevention, CDC.

The Centers for Disease Control and Prevention (CDC) recommends avoiding travel to places designated by the “Level 4: Covid-19 very high” advisory. The agency warns that anyone who has to travel should be fully vaccinated first.

Six destinations in the Tier 4 list August 23:

• Bahamas
• Haiti
• Kosovo
• Lebanon
• Morocco
• San Martin

Travel benefits and restrictions, by type of COVID-19 vaccine

Travel risk levels

The Centers for Disease Control and Prevention’s (CDC) evolving travel advisory list ranges from level 1 (“low”) to level 4 (“very high”).

Destinations that fall into the Tier 4 category — “Covid-19 is very high” — have had more than 500 cases per 100,000 residents in the past 28 days, according to the CDC’s criteria. The Tier 3 category applies to destinations that have between 100 and 500 cases per 100,000 residents in the last 28 days.

The six destinations newly added to Level 4 were previously categorized as “Level 3: COVID-19 High”.

The Prime Minister of the Bahamas implemented a pandemic curfew on Saturday, August 21, from 8pm to 5am in Exuma, Abaco and Abaco Cays, and in the north, central and southern Andros. In the midst of the fallout Magnitude 7.2 earthquake strikes southwest Haiti On August 14, the country’s prime minister reminded citizens of the need to be vigilant about the risk of infection from covid-19 during recovery efforts.

New ‘tier 3’ destinations

Ten other destinations They moved to the “Level 3: COVID-19 Rise” category on Monday. Albania, Bosnia and Herzegovina, Brunei and Liechtenstein passed the first level. Bulgaria and Serbia moved from the second tier. Greenland and Guernsey changed the “level unknown”. Paraguay fell from the fourth level.

The CDC’s Guide to Tier 3 Destinations urges unprotected travelers to avoid non-essential travel to those locations.

In its broader travel guide, the CDC recommends avoiding 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 greater risk of infection and possibly spreading some types of COVID-19,” the agency said.

you can see CDC risk level for any destination on their travel advice page.