IFR (but back in February/March 2020, a lot of people called everything “CFR”). I think he was talking about high-income countries (that’s what my 0.9% estimate for 2020 referred to – note that it’s lower for 2020+2021 combined because of better treatment and vaccines). I’d have to look it up again, but I doubt that Adalja was talking about a global IFR that includes countries with much younger demographics than the US. It could be that he left it ambiguous. Here’s the Sam Harris podcast in question; I haven’t re-listened to it yet.