How did we get coronavirus vaccines so fast?

The Covid-19 pandemic has caused global disruption – but conditions also turned out to be perfect for researchers to quickly develop vaccines that protect people against the new virus.

Knowledge from previous epidemics meant experts could move fast. And the scale of the crisis meant there was no shortage of money, volunteers or infected cases to study.

FactCheck explains how scientists managed to produce a range of Covid-19 vaccines in months, rather than years, without cutting corners on safety.