We describe response measures to an outbreak involving 128 (33.4%) coronavirus disease cases (46.1% asymptomatic) among 383 persons onboard a passenger ship. Multivariate analysis indicated that dining in certain rooms and bar areas, nationality, working department (for crew members), and quarantining onboard the ship were significantly associated with infection.
Keywords: COVID-19; SARS-CoV-2; antibodies; asymptomatic; coronavirus disease; cruise; ferry; investigation; isolation; mask; outbreak; quarantine; respiratory infections; severe acute respiratory syndrome coronavirus 2; ship; viruses; zoonoses.