50% – 75% of cases of Covid-19 are asymptomatic
I wonder if this will be like H1N1.<p>At first we only identified extreme cases and we had these terrifying reported fatality rates.<p>Then we identify more and more mild or asymptomatic cases and the rates drop and drop.<p>We’ve already seen how CFR was reported as 3 or 4%.  Then on the cruise ship full of people over 60 it’s 0.7%.  If there are lots of mild or asymptomatic cases it will likely be much lower.<p>H1N1 was identified as having a scary 0.4% CFR early on and was later found to be much lower, but we didn’t know until after the fact.<p>An example report from 2009:<p><a href="https://www.who.int/immunization/sage/1.Briand_epi_7th_July_2009_(rev_6July_09).pdf" rel="nofollow">https://www.who.int/immunization/sage/1.Briand_epi_7th_July_...</a><p>In the end it may have killed over half a million people in 2009 - but for some reason people barely noticed.  (Tangent: I wonder if it’s partly the changing media landscape from 2009 to 2020.)