Health
Unethical? Unnecessary? The COVID-19 vaccine booster debate intensifies – Science Magazine
As United States reveals its plan to offer an extra dose of COVID-19 vaccine, equity and scientific questions abound

The greater infectiousness of the Delta variant of SARS-CoV-2 has scientists and governments debating whether booster shots of COVID-19 vaccines are needed in some countries given limited vaccine supplies elsewhere.
AHMAD GHARABLI/AFP via Getty Images
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