The CDC's evolving list of travel notices ranges from Level 1 ("low") to Level 4 ("very high").

Destinations that fall into the "Covid-19 Very High" Level 4 category have had more than 500 cases per 100,000 residents in the past 28 days, according to CDC criteria. The Level 3 category applies to destinations that have had between 100 and 500 cases per 100,000 residents in the past 28 days.

All six destinations newly added to Level 4 were previously ranked at "Level 3: Covid-19 High."

CDC guidance for destinations on Level 3 urges unvaccinated travelers to avoid nonessential travel to those locations.

"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 said.

Source: CNN

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