Across 12 consecutive influenza seasons in Utah, medically-attended visits for laboratory-confirmed influenza infection peaked first among older children (12-18 years). Peak activity in older children preceded that of children 0-4 years by more than 2 days and that of peak activity among adults ≥65 years by more than 6 days.
Keywords: age groups; disease transmission; epidemiology; infectious; influenza vaccines; population surveillance; timeliness; vaccination.
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