Fig 2. Changing age distribution of population and measles cases in six focal provinces.

(A–F) Estimated percent of population in each age class for Jiangsu, Shandong, Zhejiang, Henan, Yunnan, and Gansu Provinces from national census; white indicates years for which no age-specific measles surveillance was available. (G–L) Reported measles cases (log_e[cases + 1]) per year in each age class for six focal provinces; order and white is as in (A–F).