‘Our moon shot’: Vaccine makers go ahead with unproven candidates to meet 2021 goal – that experts say may be unrealistic

In a series of breathtaking multibillion-dollar bets by vaccine makers, possible candidates to fight the new coronavirus are being prepared for production across the globe, before it’s even known whether any of them will work.
https://www.usatoday.com/story/news/2020/04/23/coronavirus-vaccine-makers-covid-19-crisis/2983177001/