An IFR of 0.5 to 1% is much greater than seasonal influenza and should be compared to the IFR of influenza (not the CFR – CFR and IFR are not the same thing).
Mounting evidence suggests the coronavirus is more common and less deadly than it first appeared.
The evidence comes from tests that detect antibodies to the coronavirus in a person’s blood rather than the virus itself.
The tests are finding large numbers of people in the U.S. who were infected but never became seriously ill. And when these mild infections are included in coronavirus statistics, the virus appears less dangerous.
“The current best estimates for the infection fatality risk are between 0.5% and 1%,” says Caitlin Rivers, an epidemiologist at the Johns Hopkins Center for Health Security.
That’s in contrast with death rates of 5% or more based on calculations that included only people who got sick enough to be diagnosed with tests that detect the presence of virus in a person’s body.
The IFR varies by age – ranging from .1% for the young to 10% for older adults. This means the number of deaths may vary quite a bit between states based on age demographics, economics and other factors.
An interesting secret: up to 75% of seasonal influenza may also be asymptomatic. The CDC acknowledges asymptomatic influenza on one of their web pages too. The asymptomatic features of Covid-19 may not be unusual, contrary to the implications of media coverage.
I am an idiot, have no expertise in any of this, and this post is for entertainment purposes only