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The prevalence of top 5 serovars among the total isolates within different age groups. Less than one years old (<1): newborn baby group; between 1 and 6 years old (1–6): Infants group; between 7 and 15 years old (7–14): juvenile; between 15 and 64 years old (7–14): adults group; more than 65 years old (>65): elderly group. The “▲” mark the predominant serovar in less than 6 years old group, and “♦” indicate the most prevalent serovar in adults.
