a) It was impossible to know the rate at which immunity would decay in January. b) Even if the vaccine only lasts 6-9 months without boosting, why would that c

a) It was impossible to know the rate at which immunity would decay in January. b) Even if the vaccine only lasts 6-9 months without boosting, why would that change your mind about taking it? It just means we need boosters. You only acquire natural immunity by getting COVID, and avoiding that is kind of the whole point. c) In any case, if you read the article, the truth about immunity decline is actually still very unclear. Antibody numbers clearly decline within months, but cellular immunity does not. Decline of protection is probably most severe in the elderly, and there still seems to be strong protection against severe illness.