Look at Indian subcontinent, the entire Indian subcontinent has over 20% of world's population and yet couple of thousand deaths due to Covid.
I believe micro-droplets being evaporated by the notorious South Asian heat is playing a part.
I believe micro-droplets being evaporated by the notorious South Asian heat is playing a part.
Still I suspect the extreme differences between countries and even regions between countries will be studied for many years to come.