Booster Shots
A Covid Booster Is the Privilege Scientists Say Will Curb Delta
- Infectious variant requires more antibodies to curb spread
- Waning antibody levels spur some countries to offer third shot
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The roll out of a third dose of Covid vaccine has sparked debate on ethical and political grounds, since a large swath of the human population is yet to receive any inoculation. But the case for boosters on scientific grounds is building.