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Epidemiology skills help us to understand disease progression in individuals and populations and how vaccination can be used to reducing the susceptible population. The vaccination program aims to reduce the number of susceptible animals by increasing immunity and reducing the transmission and spread of disease. Epidemiology also helps us to understand how the concept of herd immunity is helpful in disease control since it means that provided a high proportion of the dog population is vaccinated (more than 70-80%), the herd immunity effect will mean that the vaccination program should result in a progressive reduction in the number of new cases of rabies in dogs.