@rightwriter COVID-19 is far deadlier than the flu. For one, it’s far more likely for a healthy person to end up in the hospital and/or face long term health problems from COVID-19 than the flu. But more importantly, it’s much much more contagious.
And I am counting natural antibodies. Someone who had COVID already and shows a high number of antibodies in a test is fine and doesn’t need a vaccine. But unless they’re getting tested every two weeks, they will need a vaccine at some point.