Originally Posted by
jfsully
The CFR and IFR for COVID will not be known until this is mostly past us and we have had time to sift and sort data. Much of the back and forth on this board illustrates how erratic and inconsistent real-time epidemiologic data is.
CFR for seasonal influenza (though it varies a lot with each strain) is generally around 0.1%. Most estimates for CFR of covid appear to be settling around 1%. Some regions have reported MUCH higher CFRs for COVID, like 2-5%, but that is probably an artifact of the limited availability of testing (so only the sickest were tested).
I don’t know what the IFR is for a typical seasonal flu. This number is hard to find, probably because there is significant seasonal variation and not much appetite for doing big expensive studies every year on an illness whose properties we have a pretty good handle on. If anyone here has a solid IFR for seasonal influenza, please provide the citation.
So while IFR is an important number for individuals (“If i get exposed to this thing, what are my chances of dying?”), to compare the epidemiology and virulence of the illness with flu or others, we will probably be stuck using CFR, which is also an important number for individuals (“if I get sick with this thing, what are my chances of dying?”).