If ninety percent of a population is immune to a particular disease they protect the susceptible ten percent by a concept known as:

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Herd immunity is the concept that a high percentage of individuals in a population are immune to a particular disease, which provides indirect protection to the remaining susceptible individuals within that population. This is because the disease is less likely to spread in a population where the majority of individuals are immune, which reduces the chances of the susceptible individuals coming into contact with the disease. Acquired immunity, natural immunity, artificial immunity, and passive immunity all refer to forms of immunity that can be acquired by an individual, but they do not specifically relate to the concept of herd immunity.

If Ninety Percent of a Population Is Immune to a Particular