Paris (AFP) – A vaccine jointly developed by Pfizer and BioNTech was 90 percent effective in preventing Covid-19 infections in ongoing Phase 3 trials, the companies announced Monday. The news came as soaring coronavirus cases across the world have forced millions of people back into lockdown, causing further damage to ravaged economies.European stock markets and oil prices jumped on the announcement.Outgoing President Donald Trump, heavily criticised for his handling of the coronavirus pandemic, described the breakthrough as “great news”. Top US pandemic expert Anthony Fauci said the result wa…