A handful of states around the world have pursued 'COVID zero' strategies. Through a combination of intensive lockdowns, travel restrictions and comprehensive test and trace systems, regions like Tonga, New Zealand, Taiwan, mainland China and Western Australia managed to keep the virus at bay. But now many of these countries are facing new outbreaks on a scale they have not yet seen, and it is being driven in part by vaccine hesitancy. In this episode of Coronapod we discuss how a successful public health campaign can breed new problems when it comes to public perception of risk, and ask how vaccine complacency might be avoided in the future.News: ‘COVID zero’ regions struggle with vaccine complacencySubscribe 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.