Herd immunity (or community immunity) describes a form of immunity that occurs when the vaccination of a significant portion of a population (or herd) provides a measure of protection for individuals who have not developed immunity.
Herd immunity (or community immunity) describes a form of immunity that has been hypothesized, but not proven. It occurs when the vaccination of a significant portion of a population (or herd) provides a measure of protection for individuals who have not developed immunity.