A study analyzed the coronavirus outbreak aboard the Diamond Princess cruise ship. Video Elephant

Cruise ships’ close-contact environments of spreading infectious diseases as we’ve been reminded by this year. And the risk of spreading disease doesn’t stop when passengers disembark. 

Along with last week’s announcement that the , the agency also .

Most strikingly, it revealed the breadth of contact tracing that was done after some 11,000 passengers and crew members left ships that experienced outbreaks. The CDC said in its report that the legwork required “countless hours” of work by public health officials – even more than flight contact investigations. The report noted the CDC has expended an estimated 38,000 person-hours on the COVID-19 cruise ship response since March 14, though it’s unclear

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