Compulsory vaccination: case isolation is likely to be more effective

Draeger mentions herd immunity while discussing compulsory vaccination.1 The concept of herd immunity arises from ordinary differential equation models, with the population at risk mixing randomly. The model assumes that children in rural Scotland, Wales, or Cornwall have the same chance of contact with a person with measles in London as do children in Westminster.

Keeling and Eames showed that the structure of contact networks …