I dont disagree about Brazil. Some of Europe most likely.
But these folk now know what they are dealing with. They have decades of experience in dealing with these things. Like, remember back in the very early days, and they explained how the Waves could happen? Well, they were spot on wernt they?
But now, they have a key into the workings of it. Tons of vaccines, all using similar data, have proved to work. Out of the 3000 ish proteins that make up a virus, most they are not arsed about. Infection/Transmission are the ones. They know what they are, and what works against them.