Several wealthy nations have announced plans to give third vaccine doses in a bid to help increase the protection of their most vulnerable citizens - but the science is not clear on whether this strategy will be effective or indeed necessary. Meanwhile with limited vaccine supplies - billions around the world still have no access to vaccines at all. In this episode of Coronapod we discuss the science of boosters, the stark reality of vaccine disparity and what this means for the future of the pandemic. News: COVID boosters for wealthy nations spark outrage News feature: COVID vaccine boosters: the most important questions Coronapod: the inequality at the heart of the pandemic Coronapod: the biomarker that could change COVID vaccines Subscribe to Nature Briefing, an unmissable daily round-up of science news, opinion and analysis free in your inbox every weekday.   See acast.com/privacy for privacy and opt-out information.