Everyone’s excited about the vaccine breakthrough by developers Pfizer and BioNTech.

But what does the study tell us? When can you get it? And, crucially, how do we know that it's both effective and safe?



ITV News's Covid-19 statistician - a clinical trial specialist - Prof Jen Rogers tells Science Editor Tom Clarke exactly what you need to know in this special podcast.

Including, why we should take confidence from a small number of cases
, why the 90% effectiveness isn’t certain
, how and when we’ll know if the vaccine is safe and what happens before the vaccine gets to the public.