U.S. Issues Travel Advisory for Island Vacation Destination Due to Outbreak of Disease. The U.S. is issuing a warning to travelers who have the Seychelles islands on their itinerary. The Centers for Disease Control and Prevention (CDC) has issued a "Level 2" advisory for the Seychelles, urging U.S. travelers to "practice enhanced precautions" when visiting the island archipelago due to an outbreak of a virus.