It’s confusing- it’s one ship, the Grand Princess, but 2 sets of passengers.
I think what confused me most is the article saying those 3 possibly exposed people had helped at the senior center in previous weeks, while I thought those exposed and possibly exposed had been on the cruise ship in the last 2-4 weeks. I'm glad the senior center closed for the time being and contact tracking is making headway.
My understanding is that a ship of infected people were evacuated, the ship docked at a new port and it was not cleaned properly before another 3000 people boarded the ship. Isn't that what happened, that the ship sailed and was called back to port because a guest on the previous cruise was deadly ill?