Serendipity Led to Oxford/AstraZeneca Vaccine’s 90% Efficacy Rate

The half-dose/full dose puzzle in the results is explained.

Image: COVID-19 Vaccine Photo by Daniel Schludi via Unsplash

The researchers at AstraZeneca and Oxford University reported on Monday, November 23, 2020, that their COVID-19 vaccine is 70% effective. This announcement, coming on the heels of promising news from Pfizer/BioNTech and Moderna about their vaccines…