Coronavirus: Chances of COVID vaccine being 98% effective are 'not great', expert warns

An approved coronavirus vaccine may only end up being effective 50% of the time, the top US infectious diseases expert has warned. The chances of a COVID-19 vaccine being almost 100% effective are 'not great', Dr Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases said on Friday. 'We don't know yet what the efficacy might be. We don't know if it will be 50% or 60%. I'd like it to be 75% or more,' he told a Brown University webinar.