[DannyTN]

I don’t think so. Just bleach it down and wait 30 days.

And install germicidal UV lights in all the ducts.
That should be standard on cruise ships, if it’s not already.

[hanamizu]

“I don’t think so. Just bleach it down and wait 30 days.”

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You may well be right. But would you book a cruise on the Diamond Princess? Perhaps if they rename her and wait a couple of years...

[steve86]

That’s an idea. All cruise ships. Pretty major refit, though.