According to the Centers for Disease Control and Prevention (CDC), the number of cruise ships under investigation with COVID-19 outbreaks has risen to 86 on Tuesday, up from 68 a day earlier. The CDC is currently investigating 38 ships, with 48 additional vessels having already undergone investigation but remaining “under observation.” Another 22 ships haven’t reported any cases. Three ships reported COVID-19 cases below the investigation threshold. The most affected cruise ships belong to Carnival, Royal Caribbean, Disney, and Norwegian. “While cruising will always pose some risk of COVID-19 transmission, CDC is committed to working with cruise ship operators to ensure that cruise ship passenger operations are conducted in a way that reduces the risk of COVID-19 transmission among crew members, passengers, and port personnel,” the CDC stated on its website. The CDC’s investigation threshold for restricted voyages is 0.10 percent or more of reported COVID-19 cases in passengers or one or more cases reported in the crew. A restricted …