[didjathinkmess]

Good comment, also: the vaccinated are a fertile ground for mutations that eventually evade the vaccine.

Unless you have a study that backs up the claim that this mutation phenomenon only happens in people not vaccinated for Covid-19, you should probably stop singling them out. The phenomenon occurs in both.

[frankzinger]

The virus spreads more rapidly among and lives for longer inside the unvaccinated, as a result getting much more exposure to human immune systems, and thus giving it more opportunity to evolve.

[Robotbeat]

Those who have already had COVID are fertile ground for a variant evades the immune response from previous exposure.