Humanity has always been under constant threat from infectious disease. Globally, we are getting better at monitoring signs of a health-related crisis and alerting each other – there are far fewer deaths from pandemics today than a century ago. And modern medicine is consistently meeting new diseases with new treatements, as shown by the progress on HIV since the 1980s. But have such modern medical successes bred a sense of hubris – excessive confidence that science will always come to the rescue? Challenges to human health never cease to evolve. Vaccines and antibiotics have helped us to survive leading causes

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