The passenger vessel suffered the world's first COVID cruise outbreak, affecting 712 passengers (in February-March-April 2020), including 14 deaths. Repatriated American cruisers from the liner were among the first confirmed COVID-19 cases in the USA.
While in Japan, Diamond Princess was thoroughly disinfected and all cabin ornaments, mattresses and linens were replaced with new ones. Princess Cruises cancelled all departures March 12 through June 30, 2020, and plans to start operations (globally) on July 1. The company's Alaska 2020 program was completely cancelled (all voyages and Alaskan land tours). The Princess-operated Alaskan wilderness lodges and transportation (trains and buses) remain closed in 2020.