Highlighter vaccine efficacy against infection

Oxford/AZ reports overall reduction in PCR positivity of 54.1%, but only 2% "vaccine efficacy against asymptomatic infection."

Confused?

Allow me to explain with crudely drawn pictures why the overall findings are still quite positive. 1/8 pic.twitter.com/2gDva1GbuP

— Natalie E. Dean, PhD (@nataliexdean) February 3, 2021