Twenty-one people on Grand Princess, including two passengers and 19 crew, tested positive for coronavirus.
This was the number confirmed late Friday afternoon in the first batch of 45 samples taken Thursday on the ship. It is currently off the California coast.
Mike Pence outlines the plan
Announcing the results, US Vice President Mike Pence said there are plans to bring the ship to a noncommercial port, and that everyone on board would be tested.
All passengers confined to their rooms
Meanwhile, all passengers and the affected crew will remain isolated in their rooms. Food and beverage service are being provided by room service.
Princess Cruises said it was notified of the results just as Pence was giving his news conference.
The line is working with the US Centers for Disease Control and Prevention to determine what additional precautionary measures may be needed. The medical team was collecting information about any prescription medical refill needs.
3,533 people on board
There are 3,533 people aboard Grand Princess, including 2,422 passengers and 1,111 crew. They represent 54 nationalities.