Everything you need to know about Pfizer's Covid vaccine breakthrough

Scientists at US-based Pfizer hailed today 'a great day for science and humanity' as they revealed that 90% of people who caught Covid-19 in their trial group were ones who had not had the vaccine. https://www.dailymail.co.uk/news/article-8929665/Everything-need-know-Pfizers-Covid-vaccine-breakthrough.html?ns_mchannel=rss&ns_campaign=1490&ito=1490