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The distribution of Shigella species from three childhood shigellosis studies in southern Vietnam over fourteen years. The distribution of Shigella species from period A (n = 80), period B (n = 114) and period C (n = 103). The percentage of S. sonnei and S. flexneri are colored red and grey respectively, other Shigella species are colored black. The p value was calculated using the chi - squared test.
