[irishjuggler]

‘...as the ship is a little self-contained sealed world.”

Yeah, I think that’s pretty much it. Occasionally the media will report a norovirus outbreak at a large high school or similar. While a high school isn’t quite as “sealed” as a ship at sea, it’s semi-sealed in that you might have 1,000 people in a relatively small space, not coming and going but rather in the same place for the better part of a day.

[citizen]

I suppose long-time crew may reach a level of immunity to these routine viruses. I remember a work lunch time meal. All the women thought they were sick from the Mex food. I was not affected at all.