The World Health Organization (WHO) is working closely with the Ministry of Health (MOH), the Royal Government of Cambodia and technical partners, including the US Centres for Disease Control and Prevention (US CDC) and Pasteur Institute in Cambodia, to support the public health response to the Holland America MS Westerdam cruise ship event in the context of the coronavirus disease 2019 (COVID-19) outbreak.After several days at sea, the Royal Government of Cambodia agreed to accept the Westerdam cruise ship and the 2,257 persons on board, taking into consideration a number of factors including the needs of passengers and humanitarian considerations.Following docking at Sihanoukville Port on 14 February 2020, a decision was made by the Royal