An increasing trend of seropositivity was observed when compared between 1 and 10 years of age; however, above 10 years, the seropositivity rate declined for the EV71-A genotype while no significant change was observed for other genotypes.
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The sentences
The GMT for genotype D increased from 3 years of age, with a peak in the age group 6–7 years and a decreasing trend within 8–15 years of age ( Figure 3 ).