Introduction

There is a lot of talk about herd immunity nowadays. This article hopes to explain what herd immunity is, and what factors may affect the development of herd immunity. As this article is intended for a general audience, I will not discuss approaches to calculate herd immunity here (I may do so in a separate article if there is sufficient interest in the same). Please note that this article discusses herd immunity in a broad sense, and not in the context of a particular disease.