Herd immunity or population immunity-1

•A population with a high number of members with immunity to a particular disease or pathogen may give protection from that infection to the small number of its non-immune members. This is as a result of there being too few susceptible persons in the “herd” for the infection to circulate. This is known as “herd immunity or population immunity.”
•Immunization OR Active immunity of children can go well beyond saving individual lives. It can also help in preventing largescale outbreaks of diseases as well as keeping a disease under control (or sometimes even eliminated or eradicated e.g. polio) in the area