Good study, badly analysed IMHO.<p>If we presume the virus was still in exponential mode, then the 328 not showing symptoms could easily be those that had only just caught the virus.<p>Also you need to know the age distribution before trying to extrapolate rates to normal populations.<p>“As of February 20, tests of most of the 3,711 people aboard the Diamond Princess confirmed that 634, or 17 percent, had the virus; 328 of them did not have symptoms at the time of diagnosis. Of those with symptoms, the fatality ratio was 1.9 percent”<p>Edit: here’s the study: <a href="https://www.medrxiv.org/content/10.1101/2020.03.05.20031773v2.full.pdf" rel="nofollow">https://www.medrxiv.org/content/10.1101/2020.03.05.20031773v...</a><p>I think “quarantined” was not individually quarantined, but that the ship as a whole was quarantined.<p>ONE SURPRISING THING: high ratio of asymptomatic cases for 70+, whereas most 20-30 year olds are symptomatic: that could explain a lot about why death rates seem absurdly low for below 40 year olds - sampling error because most 20-30 show symptoms.