Guests and crew members test positive for COVID-19 aboard Princess cruise ship

Passengers and crew have tested positive for COVID-19 aboard a 15-day Princess Cruise trip through the Panama Canal which returned to the port of San Francisco on Sunday.

Those affected aboard the ship, the Ruby Princess, were either asymptomatic or had mild symptoms of COVID-19 and were isolated and quarantined, Princess Cruises said in a statement. The cruise line did not say how many guests and crew members tested positive, or when during the trip they did.

The ship has since departed San Francisco for a 15-day cruise to Hawaii.

The cruise line requires guests to present a negative COVID-19 test and proof that they have been fully vaccinated at least 14 days before the trip begins. Vaccination rates for guests and crew members of the Ruby Princess were 100%, Princess Cruises said.

The Port of San Francisco also requires that at least 95% of passengers and crew on board be vaccinated.

The cruise line said guests with positive test results who had not completed the required isolation period had returned home or been given hotel rooms for isolation and quarantine.

Princess Cruises has suspended travel for more than a year following the COVID-19 outbreaks in 2020. Coronavirus cases remain relatively stable nationwide, but health experts are concerned about a potential rise linked to the new BA.2 COVID-19 variant.

The CDC was not immediately available for comment and a dashboard that tracks COVID-19 test positivity rates from ships has not been updated since Thursday.