Fig. 5From: 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 scenarios 3 (a, b; high vaccination coverage) and 4 (c, d; low vaccination coverage). a, c 2013, b, d 2018. The axis of ordinates shows the number of population by month-old ageBack to article page