True, that is an assumption, but it may often be true. Similarly, deadlier variants can evolve that are resistant to an engineered vaccine. One can argue the

True, that is an assumption, but it may often be true. Similarly, deadlier variants can evolve that are resistant to an engineered vaccine. One can argue the defining features of a particular virus, and whether an evolved version is a variant or a novel virus. An antibody may detect features that are defining or others.