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A, Overall dengue seroprevalence and age stratification in outbreak areas, Singapore. Past exposure to dengue increased with age. B, Differences in dengue seroprevalence in different age groups in historical and new dengue areas. Younger persons (< 45 years old) who lived in historical dengue areas had a significantly higher chance of being exposed compared with their counterparts in new dengue areas (P < 0.05). Error bars indicate mean ± SD.
