the immunity or resistance to a particular infection that occurs in a group of people or animals when a very high percentage of individuals have been vaccinated or previously exposed to the infection.
herd immunity n.
[hurd] /hɜrd/ noun 1. a number of animals kept, feeding, or traveling together; drove; flock: a herd of cattle; a herd of sheep; a herd of zebras. 2. Sometimes Disparaging. a large group of people: The star was mobbed by a herd of autograph seekers. 3. any large quantity: a herd of bicycles. 4. the […]
noun 1. one of any of several breeds of dogs used originally for herding livestock, including the Belgian sheepdog, collie, German shepherd, and Old English sheepdog.
noun 1. the impulse or tendency toward clustering or acting in a group, especially the presumed instinct toward or need for gregariousness and conformity. noun 1. (psychol) the inborn tendency to associate with others and follow the group’s behaviour
[hurdz-muh n] /ˈhɜrdz mən/ noun, plural herdsmen. 1. a herder; the keeper of a herd, especially of cattle or sheep. 2. (initial capital letter) Astronomy. the constellation Boötes. /ˈhɜːdzmən/ noun (pl) -men 1. (mainly Brit) a person who breeds, rears, or cares for cattle or (rarely) other livestock in the herd US equivalent herder n. […]