Fig. 3From: Effectiveness assessment of vaccination policy against measles epidemic in Japan using an age–time two-dimensional mathematical modelThe sectional distributions of epidemiological classes in March in scenario 1 (Okayama city). a 2008, b, d 2013, c, e 2018. d, e Limited to susceptible (S) and low antibody titer classes (Rw, V1w). PA particle agglutination assay. The axis of ordinates shows the number of population by month-old ageBack to article page