Covid vaccine: what does the Pfizer vaccine news mean?
There has been some promising Covid-19 vaccine news.
A preliminary analysis shows the first effective coronavirus vaccine can prevent more than 90% of people from getting Covid-19.
But there's still a way to go before any vaccine can be given to the wider public and our lives can go back to how they were pre-pandemic.
BBC health correspondent Laura Foster helps puts this news into context.
Video by Laura Foster and Terry Saunders