AstraZeneca-Oxford COVID-19 vaccine looks promising, 70% effective on average

There is more promise in the race for the COVID-19 vaccine. AstraZeneca’s COVID-19 vaccine, developed by the University of Oxford, has shown to be 70 per cent effective in trials — and potentially up to 90 per cent after tweaking doses. Redmond Shannon explains why the lukewarm number is still a big deal to fight the pandemic.