To illustrate, let’s consider two of the most contagious viral diseases: measles and norovirus (the cause of the stomach flu). The percentage of immune individuals required to control a disease depends on how contagious the pathogen is. How many people must be immune to develop herd immunity? The percentage of the population that must develop immunity before the disease is controlled.But not all infectious diseases can be controlled through herd immunity. Herd immunity, also known as “population immunity,” refers to the situation when enough members of a population, or “herd,” develop immunity to a pathogen to prevent further outbreaks. – Originally Published By Intermountain Healthcare What is herd immunity?
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