Still.Me wrote:

Didn't know that but good to hear and I imagine in the end we will have yearly shots as it changes, much like the regular flu.

Last I read, it may well take up to five years to mutate to another strain if it behaves anything like the influenza virus. But that's (currently) guesswork on their part.

There's also the possibility, that when COVID-19 finally does mutate, it will do so into something much less virulent. Right now, we can but hope.