herd immunity n.
Resistance to the spread of infectious disease in a group because susceptible members are few, making transmission from an infected member unlikely.
The immunologic status of a population, determined by the ratio of resistant to susceptible members and their distribution.
|a stew of meat, vegetables, potatoes, etc.|
|a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.|