• Jessica R Cataldi, Laura P Hurley, Megan C Lindley, Sean T O'Leary, Carol Gorman, Michaela Brtnikova, Brenda L Beaty, Lori A Crane, David K Shay, and Allison Kempe.
• Adult and Child Consortium for Health Outcomes Research and Delivery Science, University of Colorado Anschutz Medical Campus and Children's Hospital Colorado, Aurora, CO, USA. Jessica.Cataldi@cuanschutz.edu.
• J Gen Intern Med. 2021 Jul 1; 36 (7): 2030-2038.

BackgroundSeveral different types of influenza vaccine are licensed for use in adults in the USA including high-dose inactivated influenza vaccine (HD-IIV) and live attenuated influenza vaccine (LAIV). HD-IIV is licensed for use in adults ≥ 65 years, and recommendations for use of LAIV have changed several times in recent years.ObjectiveWe sought to examine family physicians' (FPs) and general internal medicine physicians' (GIMs) perceptions, knowledge, and practices for use of HD-IIV and LAIV during the 2016-2017 and 2018-2019 influenza seasons.DesignE-mail and mail surveys conducted February-March 2017, January-February 2019.ParticipantsNationally representative samples of FPs and GIMs.Main MeasuresSurveys assessed HD-IIV practices (2017), knowledge and perceptions (2019), and LAIV knowledge and practices (2017, 2019).Key ResultsResponse rates were 67% (620/930) in 2017 and 69% (642/926) in 2019. Many physicians believed HD-IIV is more effective than standard dose IIV in patients ≥ 65 years (76%) and reported their patients ≥ 65 years believe they need HD-IIV (67%). Most respondents incorrectly thought ACIP preferentially recommends HD-IIV for adults ≥ 65 years (88%); 65% "almost always/always" recommended HD-IIV for adults ≥ 65 years. Some physicians incorrectly thought ACIP preferentially recommends HD-IIV for adults < 65 years with cardiopulmonary disease (38%) or immunosuppression (48%); some respondents recommended HD-IIV for these groups (25% and 28% respectively). In 2017, 88% of respondents knew that ACIP recommended against using LAIV during the 2016-2017 influenza season, and 4% recommended LAIV to patients. In 2019, 63% knew that ACIP recommended that LAIV could be used during the 2018-2019 influenza season, and 8% recommended LAIV.ConclusionsMany physicians incorrectly thought ACIP had preferential recommendations for HD-IIV. Physicians should be encouraged to use any available age-appropriate influenza vaccine to optimize influenza vaccination particularly among older adults and patients with chronic conditions who are more vulnerable to severe influenza disease.© 2021. Society of General Internal Medicine.

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