While there is some signs that new cases leveling off, and some knowledge for better treatments is now being practiced, now that we have more data you can tell that our testing in spring was outrageously below where it needed to be. Not a surprise given how quickly things developed. IMHO - this should in no way be interpreted to mean the virus is less deadly now. (I realize you aren't explicitly making that claim.)
We've never known the TRUE number of cases - and we never will. As such, the actual fatality rate is MUCH lower than the case fatality rate. Now that testing infrastructure is in place - even if woefully inadequate as it is today, the % of deaths from known cases is expected to lower as it will gravitate towards the actual fatality rate.
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