Infection and Mortality Rates
If we want a baseline measure, what could be better than the worst possible environment for spreading vs containment-by-isolating, than a crowded ship. Anyone who regularly cruises.... understands how quickly a 'gastro' bug can spread.... and that's purely surface-contamination.
Cruise ship outbreak helps pin down how deadly the new coronavirus is | Science News
This Cruise Ship Has the Highest COVID-19 Infection Rate in the World | Time
and, IF spread by air-conditioning... then this cruise ship's system is virus Heaven !
Study: Ship's AC system likely spread COVID-19
Remember, having sufficient disposable (one use) face masks could be problematical, never mind (enforcing) wearing them !
The figures I'm finding indicate ships, be they for pleasure or business, have near-identical infection and death-rates. Obviously lower on a Navy vessel as the older vulnerable members have retired...