Figure 15.14 The cyclical occurrence of measles in a human population. Before vaccinations became available in 1968, the human population in London, England, experienced cycles of measles every 2 years. Once vaccination became available and the number of people getting vaccinated increased, the number of measles cases declined and the fluctuations no longer occurred.
Data from P. Rohani et al., Opposite patterns of synchrony in sympatric disease metapopulations, Science 286 (1999): 968–971.