It's been just a few months and vaccine manufacturers and public health officials are already talking up—not only the likelihood, but necessity of—getting booster coronavirus shots.

After leaving an epic +2-hour tennis match (in which I squeaked out a 3rd set victory), I couldn't help but overhear the four women taking the court after me. "I finally found a double-vaccinated nanny!" one of them remarked, punching their fist into the air for