The outbreak epidemic curve is shown in Figure 2. In retrospect, crew members with symptomatic confirmed or suspected Covid-19 had symptoms as early as March 11, 2020, and continued to receive diagnoses up to the end of the analysis period. Epidemic curves according to sex and crew type show parallel infection rates for men and women. Although the ship docked in Guam on March 27, 2020, the outbreak continued for at least an additional 6 weeks.