The Centers for Disease Control and Prevention has issued a latest warning to Americans about traveling to Sweden, Morocco, and Guatemala, adding the three countries to its highest travel risk as COVID cases increased in recent days.

The three nations were previously listed with a Level 2 “moderate” risk warning for travelers, moving as much as the Level 3 “high” risk on Tuesday.

A Level 3 destination has had greater than 100 COVID cases per 100,000 residents previously 28 days, the CDC said.

Now, Level 3 is the agency’s highest travel warning, because it has reserved its Level 4 “highest” risk category for special circumstances resembling an extreme level of COVID cases, the emergence of a latest variant, or a healthcare infrastructure collapse.

Currently, there aren’t any locations within the Level 4 category out of the about 235 places which are being monitored by the CDC.

Sweden now joins much of Europe that’s listed within the Level 3 category, together with parts of the Caribbean, Mexico, Canada, Brazil, Malaysia, and Thailand.

Currently, there are about 115 nations listed within the CDC’s Level 3 “high” risk category.

The CDC recommends that American travelers be up to this point with their COVID shots prior to traveling to a Level 3 nation but warns that “Even for those who are up to this point along with your COVID-19 vaccines, chances are you’ll still be in danger for getting and spreading COVID-19.”

Also seeing changes on Tuesday were three locations that were moved into the Level 2 “moderate” risk category for travel – Jordan, Lebanon, and North Macedonia.

A Level 2 destination has between 50 to 100 COVID cases per 100,000 residents previously 28 days.

Each Jordan and Lebanon saw their COVID situation worsen, moving up from Level 1 “low” risk, while North Macedonia had an improvement in its COVID cases, dropping from the Level 3 “high” risk category.

Currently, there are about 20 nations listed within the Level 2 “moderate” risk category by the CDC, including Colombia, Iraq, Saudi Arabia, Bolivia, Romania, Poland, and Ethiopia.

Updated on the CDC’s Level 1 “low” risk category were two destinations – Saba and Saint Pierre and Miquelon.

A Level 1 destination has between 49 and fewer COVID cases per 100,000 residents reported over the past 28 days.

Each nations had improvements of their COVID cases, with Saba dropping from Level 2 “moderate” risk and Saint Pierre and Miquelon moving down from Level 3 “high” risk.

Also listed within the Level 1 “moderate” risk category are El Salvador, Fiji, Moldova, Indonesia, the Philippines, Cuba, and India.

Finally, the CDC downgraded 4 locations to its “unknown” category, which incorporates places where reliable details about their COVID situation is unknown. These destinations could have ongoing warfare or unrest, and it’s difficult to find out the danger of traveling there.

Additions to the “unknown” category include Haiti, Hungary, Iran, and Mozambique. Haiti, Iran, and Mozambique were previously listed at Level 1 “low” risk, and Hungary sat within the CDC’s Level 3 “high” risk category.

The CDC advises against traveling to an “unknown” risk nation because of the high risks of contracting COVID-19. Other destinations listed within the “unknown” risk category include Macau, the Maldives, Belarus, Libya, French Polynesia, and Venezuela.