> Interesting idea. Infect everyone with the “mild” version of SARS to protect against the severe one. Two notes: 1. SARS-CoV is the 2003 strain, which is gen

> Interesting idea. Infect everyone with the “mild” version of SARS to protect against the severe one. Two notes: 1. SARS-CoV is the 2003 strain, which is generally accepted as being the more severe - yet more difficult to transmit - strain of coronavirus. So in this case (unless I'm misunderstanding), people who caught and survived the more severe SARS-CoV in 2003-2004 are less likely to be as affected by the milder SARS-CoV-2 strain. Worth noting that the population of people infected by SARS-CoV is not all that high, so the value isn't so much that there's a population protected from SARS-CoV-2 as it's that there's enough of a similarity between the two strains that we could learn a few useful things about treating the latter. 2. The model you described, using a milder agent to protect against a severe one, is the original concept behind vaccines, done by Dr. Edward Jenner with Cowpox to protect against Smallpox. https://en.wikipedia.org/wiki/Smallpox_vaccine https://en.wikipedia.org/wiki/Smallpox_vaccine