Figure 1From: Effects of campaign for postpartum vaccination on seronegative rate against rubella among Japanese women Regional differences in prevalence rate of pregnant women susceptible to rubella. A, Hokkaido prefecture; B, Toyama prefecture; C, Tochigi prefecture, D, Tokyo 1; E, Tokyo 2; and F, Kanagawa prefecture. Closed, shaded and open bars indicate hemagglutination inhibition assay (HI) titers of < 8×, 8×, and 16×, respectively. Total number of pregnant women tested is indicated at the bottom.Back to article page