The US Centers for Disease Control and Prevention added 16 destinations to its "very high" Covid-19 risk level on Monday, including Greece, Ireland and the US Virgin Islands.

According to the CDC, a risk designation of "Level 4: Covid-19 Very High" means people should avoid travel to these locations. Those who must travel should be fully vaccinated first.

"Fully vaccinated travelers are less likely to get and spread Covid-19. However, international travel poses additional risks, and even fully vaccinated travelers might be at increased risk for getting and possibly spreading some Covid-19 variants," the agency says.

Destinations that fall into the "very high" risk category have had more than 500 cases per 100,000 residents in the past 28 days, according to CDC parameters.

The following 16 destinations moved to the CDC's "Level 4: Covid-19 Very High" category on August 2:

Here are some other typically popular travel destinations on the Level 4 category (as of August 3):

Source: CNN

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