7 Countries Added to CDC's, 'Very High' COVID-19 Travel Risk List.<br />CNN Travel reports that the U.S. Centers for Disease Control and Prevention (CDC) continues to regularly update its travel advisories list.<br />CNN Travel reports that the U.S. Centers for Disease Control and Prevention (CDC) continues to regularly update its travel advisories list.<br />The latest update now includes Switzerland and <br />Puerto Rico among the highest-risk <br />destinations for travelers.<br />The latest update now includes Switzerland and <br />Puerto Rico among the highest-risk <br />destinations for travelers.<br />The CDC recommends that people should avoid traveling to any location designated with the "Level 4: COVID-19 Very High" notice.<br />The agency also advises that anyone who must <br />travel should be fully vaccinated first.<br />The list of Level 4 nations now includes:.<br />Azerbaijan, Estonia, Guam.<br />Azerbaijan, Estonia, Guam.<br />North Macedonia, Puerto Rico.<br />North Macedonia, Puerto Rico.<br />Saint Lucia and Switzerland.<br />According to the CDC's criteria, those <br />destinations have all had over 500 cases <br />per 100,000 residents in the past 28 days.<br />Switzerland's Federal Office of Public Health has reported 659 laboratory-confirmed COVID-19 cases per 100,000 inhabitants in the past four weeks.<br />Switzerland's Federal Office of Public Health has reported 659 laboratory-confirmed COVID-19 cases per 100,000 inhabitants in the past four weeks