There are a number of open questions as to how the covid-19 coronavirus spread on board the Diamond Princess cruise ship, where passengers were quarantined since 3 February
Source:
https://www.newscientist.com/article/2234734-we-dont-know-how-covid-19-spread-on-the-diamond-princess-cruise-ship/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home