When will we have a coronavirus vaccine?

While the official 12- to 18-month timeframe still stands, experimental Covid-19 inoculations for high-risk groups could be rolled out much earlier

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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 former, probably, but it's complicated because this pandemic is forcing change at almost every step in the process by which a new vaccine arrives at a needle near us.