There was great excitement around the world (and on the stock markets) when it was announced that a potential vaccine for Covid-19 could have an efficacy rate of 90% and could be winging it's way around the world as early as the end of the year.

But how does it work and where does it leave us for 2021? Could a summer of normality be in our future if we can just battle through winter?

Paul Moynagh is a leading immunologist at Maynooth University and he joined Dermot and Dave to explain what will need to happen for life to return to normal.