Herd Immunity
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Herd immunity
Herd immunity occurs when a large percentage of a population is immunised Mass vaccination programs are designed to establish herd immunity to a disease Establishing herd immunity is important in reducing the spread of diseases
Herd immunity - protecting of non immunised individuals
Non immune individuals are protected as there is a lower probability they will come into contact with infected individuals
Difficulties with mass vaccination
Difficulties can arise when widespread vaccination is not possible due to poverty in the developing world or when vaccines are rejected by a percentage of the population in the developed world
Herd immunity threshold
The herd immunity threshold depends in the type of disease, the effectiveness of the vaccine and the density of the population