Case fatality rate

Eight influenza-like illnesses occurred, seven of which were 2009 H1N1 influenza viruses.

An example they say here of the role of vitamin D in reducing the risk of death from pandemic respiratory tract infections is found in a study of CFRs resulting from the 1918 to 1919 influenza pandemic in the United States.

Fatality rates averaged 1.7 persons for every 100 influenza cases, but averaged 25.5 per 100 cases of pneumonia.

Fatality rates, 1.7 for every 100 people with the flu, 25 for every 100 with pneumonia.

... and you're talking to a...

And by the way, he didn't specify whether he was talking about the case fatality rate or the infection fatality rate.

The, the-- There's a big difference between those two numbers, the CFR and the IFR.

Those are completely, uh, different, uh, because you can have many more infections than cases, uh, at least in the old parlance.

We used to call cases medically significant, uh, disease.

Uh, infections were just simply, "Yeah, you, you got something," or maybe don't have...

You maybe have no symptoms, maybe you have some symptoms, but it's not, it's not serious.

Um, mm, so the IFRs, m- m- for something like a coronavirus, is going to be dramatically lower than, uh, the, than the, uh, than the C- than the CFR.