Good study, badly analysed IMHO. 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. Also you need to know the age distribution before trying to extrapolate rates to normal populations. “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…
Asymptomatic ~50% for 50+.
Very interesting if that turns out to be fact.