Vaccine efficacy, effectiveness and protection

This article is part of a series of explainers on vaccine development and distribution. This document outlines the difference between vaccine efficacy, effectiveness and protection.  

Part 1: How do vaccines work?

Part 2: How are vaccines developed?

Part 3: Manufacturing, security and quality control of vaccines.

Part 4: The different types of COVID-19 vaccines 

Part  5: Fair and equitable allocation of COVID-19 vaccines 

Part 6: Country readiness for COVID-19 vaccines

Part 7: The effects of virus variants on COVID-19 vaccines

Part 8: Safety of COVID-19 vaccines

Part 9: Getting the COVID-19 vaccine

Part 10: Side effects about COVID-19 vaccines

Part 11: How to talk about vaccines