COVID VACCINE BOOSTERS: THE MOST IMPORTANT QUESTIONS

Concerns over waning immunity and SARS-CoV-2 variants have convinced some countries to deploy extra vaccine doses - but it's not clear to scientists whether most people need them. Concerns over waning immunity and SARS-CoV-2 variants have convinced some countries to deploy extra vaccine doses - but it's not clear to scientists whether most people need them.

Automated summary

Some countries are considering deploying extra vaccine doses in response to concerns over waning immunity and SARS-CoV-2 variants, but it is still unclear to scientists whether most people need them.