Many countries with already high vaccination rates are considering offering people an additional coronavirus vaccine dose. But are these booster shots necessary? And what about the issue of vaccine equity? The Guardian's Natalie Grover examines the costs and benefits of possibly introducing a third jab

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Does Covid immunity wane and will vaccine booster jabs be needed? ► https://www.theguardian.com/world/2021/aug/25/does-covid-immunity-wane-and-will-vaccine-booster-jabs-be-needed

Covid booster jabs may only be needed for 40% of at-risk group – study ► https://www.theguardian.com/society/2021/aug/24/covid-booster-jabs-may-only-be-needed-for-40-of-at-risk-group-study

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