Figure 5: Spatial vaccination strategies.
From: Hand, Foot, and Mouth Disease in China: Critical Community Size and Spatial Vaccination Strategies

(A) Vaccination targeted in counties with the lowest population, (B) vaccination in the highly populated counties, (C) Vaccination in the counties where population is the close to the regional CCS, and (D) vaccination in randomly selected counties. (E) Vaccination in high prevalence counties. Red indicates vaccinated areas, white indicates unvaccinated areas, grey indicates areas excluded from the analysis. This figure was generated using the open source statistical software R (cran.r-project.org), version number 3.0.3, including packages maptools and foreign.