Interesting. That's not a vaccine anymore that's a strain of SARS-CoV-2 that's never produces symptoms, but is still similar enough to the original to prime the

Interesting. That's not a vaccine anymore that's a strain of SARS-CoV-2 that's never produces symptoms, but is still similar enough to the original to prime the immune system. Presumably it would out compete the original in a Darwinian sense, because people who caught it would never get sick and stay home. Risky, though, because if it turns out to be less benign than we thought - or mutates in such a way as to become lethal - we've just started a second pandemic.