The US drug maker Moderna said on November 16, 2020, that its experimental Covid-19 vaccine was 94.5 per cent effective in preventing the disease in a late-stage clinical trial. Moderna released the preliminary data only a week after another US pharmaceutical company, Pfizer, said a vaccine it is developing with Germany’s BioNTech was shown to be over 90 per cent effective. Ten other companies are also conducting clinical trials on coronavirus vaccines, including research under way in Australia…