Oxford Covid-19 vaccine has good safety record and efficacy

The video discusses the interim analysis of vaccine trials published in The Lancet, highlighting a 70% efficacy rate and no safety concerns. It covers trial demographics, focusing on younger adults initially, with plans to include more older adults. The video explains that current data shows individual protection but not herd immunity. It anticipates significant changes in the coming year with widespread vaccination. The importance of regulatory approval and the need for actual vaccination to return to normalcy are emphasized.

How does herd immunity relate to vaccine efficacy according to the text?

What is necessary for vaccines to help return to normalcy?