Professor Jonathan Van-Tam speaking at Downing Street press conference

The video discusses the announcement of a significant scientific breakthrough by Pfizer Biontech regarding a new vaccine. It acknowledges the contributions of clinical trial volunteers and scientists. The speaker emphasizes the importance of the breakthrough while advising caution and explaining the next steps, including the need to review safety data. The video highlights that safety is paramount, even more so than the vaccine's effectiveness.

What was the significance of the announcement made by Pfizer Biontech?

What role did volunteers play in the clinical trials mentioned?

What are the next steps after the announcement of the vaccine?

How many volunteers participated in the major trial being reported?

Why is safety data considered more important than vaccine effectiveness according to the speaker?