SARS-CoV-1 case fatality rates were about 9% and MERS-CoV case fatality rates were over 30%.
And now there is a newly discovered MERS-CoV relative, which some scientists have warned may be only one or two mutations away from making the jump to humans, and might be as deadly as MERS-CoV in humans.
But in the case of the SARS-CoV-2 pandemic, we've found that our initial CFR was higher than the true IFR. Can we expect that the CRFs for SARS-CoV-1 and MERS-CoV are similarly misleading? Are we able to estimate IFRs for these coronaviruses any better now that we have so much experience with SARS-CoV-2?