COVID-19 | US pharmaceutical corporation Pfizer on Monday said its experimental vaccine was more than 90 percent effective in preventing Covid-19 based on initial data from a large study, a major victory in the fight against a pandemic that has killed over 1 million people, roiled the world's economy and upended daily life.

Pfizer and German partner BioNTech are the first drugmakers to show successful data from a large-scale clinical trial of a coronavirus vaccine. The companies said they have so far found no serious safety concerns and expect to seek US emergency use authorisation later this month...