Then why did the "worst" variant so far come from a place (India) with extremely low vaccination rates at the time? It's a numbers game. With chickens there ar

Then why did the "worst" variant so far come from a place (India) with extremely low vaccination rates at the time? It's a numbers game. With chickens there are billions of chickens created and destroyed annually, and almost all of them are vaccinated in utero, so it makes sense that we'd see the disease get selectively deadlier. With Covid if you knock down the disease rate to something that's basically a few cases per month via vaccinations, you won't have enough chances for mutations to occur.