INTRODUCTION COVID-19 is transmitted from human-to-human. Droplets from a diseased person e.g. from coughing and sneezing, landing on objects and surface around the person. Other people catch the virus by touching the objects and the surfaces and then touch their eyes/nose/mouth. Also people can catch COVID-19 by breathing the droplets of diseased person if they are in the same place (and close of course). Seafarers (on board ship or on leave) who visited an area where coron