EVERY hospital is a disease vector.
The virus is complete aerosol and infects everyone and everything in the same room with it.
MAYBE (pure conjecture, based solely on observation) it also is spread in the HVAC. It’s the rapid spread aboard ships that causes my suspicion on this.
The coronavirus was found on both the Princess Diamond and the Grand Princess, 17 days after first discovering the virus.
https://www.850wftl.com/the-cdc-finds-the-virus-survived-17-days-on-a-ship-after-people-left/