Coronavirus vaccine: when will we have one?

When will we have a Covid-19 vaccine? Public-facing scientists such as the UK’s chief scientific adviser, Sir Patrick Vallance, and his US counterpart, Anthony Fauci, keep repeating that it won’t be before 12 to 18 months. But other voices – including some of those in the race to create a vaccine themselves – have suggested that it could be as early as June. Who is right? The Guardian