COVID-19 vaccine 'more than 90% effective' The first COVID-19 vaccine candidate to present results has shown 'more than 90%' efficacy in a study on more than 43,000 people. by Nick Bostock Sign in to continue Sign In Email address Password Stay signed in Trouble signing in? Reset password: Click here Need help? Email us Register FREE Limited free articles a month Free email bulletins Register Now Register Now Take a 30-day trial Join MIMS now and pay nothing for the first 30 days Join GPOnline now and pay nothing for the first 30 days Sign Up Sign Up