Drug makers and research centres around the world are working on Covid-19 vaccines, with large global trials of several of the candidates involving tens of thousands of participants well under way.
The following is what's known so far about the race to deliver vaccines to help end the coronavirus pandemic. Who is furthest along?Moderna Inc is the second US pharmaceutical company to release interim data showing that its vaccine worked in a large, late-stage clinical trial.
The biotech firm said its vaccine was 94.5% effective. One week ago, US drugmaker Pfizer Inc and German partner BioNTech SE released interim data and said their shot was more than 90% effective at stopping Covid-19.