Should the definition of ‘fully vaccinated’ include boosters?

With the United States in the midst of another surge in COVID-19 cases driven by the Omicron variant, top health officials in the Biden administration have started rethinking the requirements that qualify Americans as being fully vaccinated — and whether booster shots should be required as part of the criteria.

President Biden and government health officials have strongly recommended that every eligible adult get a booster shot, citing evidence that the extra dose can substantially increase immune protection against the virus. But, so far, the Centers for Disease Control and Prevention still...