The worst version' of COVID is spreading. Can we update our vaccines in time?
For the last 18 months, the original COVID-19 vaccines — first as a two-dose series, then as boosters — have done an extraordinary job shielding us from illness, hospitalization and death. Globally, they saved nearly 20 million lives in 2021 alone. Even today, unvaccinated Americans are twice as likely as vaccinated Americans to test positive for COVID — and six times as likely to die from the disease.
But viruses evolve, and vaccines should too.
