Tag: vaccine enthusiasm

In one sense, this is how it was always supposed to go: When viruses evolve, vaccines should follow, and sometimes try to leap ahead. The COVID-19 shots that the U.S. has used to inoculate hundreds of millions of people are simply so new that they’ve never had to undergo a metamorphosis; up until now, their original-recipe ingredients have stood up to SARS-CoV-2 well enough. But the virus they fight has changed quite radically, and this fall, the vaccines will finally,