The most important work that I've done this year - we found that the IFR of COVID-19 is double as high in developing countries compared to high-income places medrxiv.org/content/10.110… 
(The graph above is a new figure that will soon be in the updated medrxiv preprint)
As you can see from the figure above, this difference is largest in young people and tapers off in the elderly. By age 80, the IFR is only 1.3x higher in developing countries than high-income areas
This MAY (emphasis on the may) be because the treatments we've got for the disease have the biggest impacts on people who already have a good chance of surviving, and the reductions are less evidence in older people
But, as we note in the paper, it is a global tragedy that a Zambian 20-year-old (for example) is nearly three times more likely to die if they catch COVID-19 than a Belgian person of the same age
If you haven't seen the update @MackayIM @angie_rasmussen @BillHanage @ArisKatzourakis @trishgreenhalgh @MaxCRoser @amymaxmen @MoNscience
Also, we looked at death rates before vaccines were widespread to avoid that confounding factor. It's likely this divergence has grown substantially as high-income nations have immunized their populations while ignoring developing countries
(The example of Zambia vs Belgium were simply two studies that assessed IFR. Zambia was included in our analysis)
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