COVID-19 boosters: What you need to know

As the virus evolves and new variants emerge, will the world need booster vaccines to get ahead of COVID?

Will the world need COVID-19 vaccine booster jabs? Even as most nations struggle to administer a first round of doses to protect their populations, evidence is emerging that booster shots may eventually be necessary. Top United States officials say it is too early to call for boosters, but vaccine maker Pfizer is pushing for government approval and Israel announced it will offer booster jabs to at-risk people who already had the vaccine. Here is what is driving the debate: