The company said that those who had tested positive would either be taken to hotels coordinated in advance for quarantine or return home themselves.
Starting on Friday, January 7, San Francisco Port officials announced that all disembarking liners would be required to test all guests whose vaccines were not up-to-date, including people who had not gotten their booster shot.
Ruby Princess started sailing in San Francisco on December 27 and made her way down the coast with a final call port in Cabo San Lucas (Baja California Mexico) on January 2.
According to the CDC's website, Ruby Princess had been under the yellow (color-coded COVID status) which means that at least 0.1% of the passengers onboard had confirmed COVID cases.
For more Ruby Princess incidents and accidents see the ship's CruiseMinus page.