“…Higher sensitivity among younger children is likely due to higher virus shedding in this age group (6,11,16). Most studies have failed to report the performance of RIDTs exclusively among the elderly or grouped them together with other adults (4,12). We found a higher sensitivity of RIDTs for influenza virus A in the elderly than among adults 20 to 64 years of age, which may be related to having more severe disease, prolonged shedding, and high viral loads, which leads to better sensitivity (11,15,17).…”