Covid-19 vaccine developed by German company BioNTech and Pfizer has proven to be 90% effective, phase 3 trials have shown. The interim analysis looked at the first 94 confirmed cases of Covid-19 among the more than 43,000 volunteers who got either two doses of the vaccine or a placebo. It found that fewer than 10% … Continue reading Covid-19: German company BioNTech and Pfizer say their vaccine is 90% effective