The path to a COVID-19 vaccine: what's the story so far?

The University of Oxford and AstraZeneca announced a third working COVID-19 vaccine on November 23, which they say is 70% effective. It follows results being released for two other vaccines — developed by Pfizer and Moderna — which showed 95% efficacy in their late-stage trials. Here is what's happening.

The path to a COVID-19 vaccine: what's the story so far?

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