This is a good question. It also highlights the danger of a lay-interpretation of these results. It is certainly already known that exposure to one viral strai

This is a good question. It also highlights the danger of a lay-interpretation of these results. It is certainly already known that exposure to one viral strain can weaken response to others. But this fact has to be taken as part of a body of knowledge on how these effects balance each other to come to any kind of cost-benefit conclusions. https://en.wikipedia.org/wiki/Original_antigenic_sin https://en.wikipedia.org/wiki/Original_antigenic_sin