A few short generations ago, New Zealand was beset by a virus that closed schools, churches, cinemas and campgrounds and put people in quarantine. Polio killed at least 835 New Zealanders and paralysed many more. Regular epidemics were only banished in the 1960s by a vaccine decades in the making. Now, as the world awaits the rollout of COVID-19 vaccines, how have things changed? What has science learned about designing tools to help our immune systems fight back?
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