As the U.S. faces a fourth COVID-19 wave, the CDC recommended at-risk people to avoid cruise ships even if they're vaccinated. The new guidance applies to older adults, people with certain medical conditions and pregnant and recently pregnant people. Prior to Friday’s announcement, the agency recommended that only people who were not fully vaccinated against COVID-19 avoid cruises. 📷: @gettyimages #travel #covid19 #cruiseships