For those who don't know (including me), IFR means Infection Fatality Rate. "applies to infectious disease outbreaks ... [and] represents the proportion of deaths among all infected individuals, including all asymptomatic and undiagnosed subjects." https://en.wikipedia.org/wiki/Case_fatality_rate

The problem is that the fatality rate for all medical problems goes up when your healthcare system is overwhelmed and your providers are sick or dying.

Don’t get appendicitis when your local hospitals are setting up tent cities to cope with the demand.