On Sept. 24, 2019, the American Academy of Family Physicians (AAFP), American Academy of Pediatrics (AAP), American College Health Association (ACHA), American College of Obstetricians and Gynecologists (ACOG), American Pharmacists Association (APhA), Society for Adolescent Health and Medicine (SAHM), and Immunization Action Coalition (IAC) released “Dear Colleague” letter stressing importance of 16-year-old immunization visit.