I have a question for anyone who has a serious level of knowledge on virus evolution: As viruses evolve over time is there any correlation to severity - do they have trade offs as they evolve? I am hoping that it would be some kind of trade off that the virus makes in that it can spread more easily but not be as severe (I understand that it is unlikely nature requires a trade-off). I ask as my concern is that while t…
One thing that makes Covid-19 a bit different from other viruses that have trended towards milder infections is its long incubation time (while still being infectious). So it can already spread pretty easily even if it's killing those people, and thus there's not a lot of darwinian pressure to become milder. It might still trend towards that over time, but it will probably be slower at it than other viruses, and thus…
A new variant need only replicate slightly faster to dominate (eventually).