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This study combines data from two large trials in Denmark and Spain involving over 466,000 older adults. It compares the high-dose flu vaccine (Efluelda/Fluzone High-Dose) to the standard-dose flu shot to see which better prevents severe outcomes like hospitalization for flu or p…

This completed study tested whether sending behavioral nudges through Denmark's official electronic letter system could increase flu vaccination among adults aged 18-64 with chronic diseases. Over 300,000 participants were randomly assigned to receive different types of letters o…

This large study tested whether a high-dose flu vaccine works better than the standard-dose shot in adults 65 and older. Over 332,000 participants were randomly assigned to receive either the high-dose or standard-dose vaccine. Researchers tracked hospitalizations for flu, pneumo…

This study tested whether sending digital letters to patients with chronic kidney disease and their family doctors could increase the use of recommended medications. Over 28,000 adults in Denmark took part. The goal was to see if simple reminders through the official government e…