Coronavirus: Your vaccine questions answered by an expert

The UK begins a mass Covid-19 vaccination programme on Tuesday, beginning with the elderly, health workers, and carers. The country was the first to approve use of the Pfizer/BioNTech vaccine.

Is the vaccine safe for people with chronic illnesses? What demographics was the vaccine tested on? Dr Penny Ward, a professor of pharmaceutical medicine, answers members of the public's questions about the Covid-19 vaccine.

More of your questions about the vaccine are answered here.

Video produced by Michael Cowan

Graphics by Mel Lou