Cruise ships are convenient floating hotels by which to see far-flung parts of the world – but as an epidemiologist, I know they are also everything an infectious pathogen could want: thousands of strangers packed into enclosed spaces for days or weeks, sharing dining rooms and high-touch surfaces such as elevator buttons and handrails, breathing recirculated air.
Each new port of call where passengers can explore for a few days is an opportunity for germs to embark – and once they do, they encounter a highly efficient setting for hopping from host to host.
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