I should have been more clear -- the cramming together of passengers during the Muster Drill gives Covid (or other viruses) a golden opportunity to spread. Agree that it can also be picked up in any other area of the ship where there are a lot of people (shows, Royal Promenade, bars, MDR etc.) but I think it helps to eliminate an event that has the potential to be a super spreader. I think E-muster was part of RCCL and NCL's Healthy Sail Panel recommendations.