https://www.siliconvalley.com/2022/03/28/cruise-ship-reports-covid-19-outbreak-in-san-francisco/ > Several vaccinated passengers aboard a cruise ship that returned Sunday to San Francisco from a 15-day Panama Canal trip tested positive for COVID-19. > Princess Cruises said in a statement that “during the cruise we identified some positive COVID-19 cases amongst our guests and crew members” aboard the Ruby Princess ship, though all had been vaccinated.