The Centers for Disease Control and Prevention (CDC) on Monday warned Americans against travel to several more European destinations, including Sweden, adding the countries to its highest-risk category for travel. In its weekly update of COVID-19 travel advisories, Malta, Moldova, and Sweden were added to the agency’s “Level 4: Covid-19 Very High” category, which indicates more than 500 cases per 100,000 residents registered in the past 28 days. For the European hotspots, the travel warning was raised from level three to level four or “very high.” The destinations now join neighboring countries including Austria, Belgium, Croatia, Denmark, Germany, Italy, and Portugal, in the CDC’s highest risk category. “Avoid travel to Sweden,” the CDC said in its travel advisory. “If you must travel to Sweden, make sure you are fully vaccinated before travel.” The U.S. State Department has released similar travel advisories for all countries considered level four hotspots which now …