When you consider how many people used to die of diseases like smallpox, diphtheria and even the flu (as in 1918) a small number of adverse side effects are something we have to accept, just as we accept highway death (~40K per year) for the benefits of motorized transportation.
When you consider how many people used to die of diseases like smallpox, diphtheria and even the flu (as in 1918) a small number of adverse side effects are something we have to accept, just as we accept highway death (~40K per year) for the benefits of motorized transportation.