The study will test two tactics to improve uptake of two vaccines in adults. The vaccinesprevent COVID-19 and influenza. Both are common and harmful. Most adults do not geteither vaccine. This is despite strong recommendations that all adults get both vaccines.The study will involve adult patients at eight Mayo Clinic primary care practices inRochester and Kasson. The study will test the two tactics together. Four clinics will getthe two tactics. The other four clinics will not. The study will randomly assign the twotactics to the clinics. One tactic is to send a letter by US mail to the patient. Theletter will state strong recommendations on getting both vaccines now. It will tellpatients how to get the vaccines now. The second tactic is to send monthly emails toclinicians. It will remind them to use every visit to vaccinate patients against COVID-19and influenza. The study will compare the uptake of the two vaccines after six months inthe clinics with and without the two tactics.