RESUMO
INTRODUCTION: Medicare-Medicaid beneficiaries are at high risk of experiencing severe disease from influenza. Yet, immunization assessment followed by influenza vaccination (when needed) are not regularly performed at Community-Based Adult Services (CBAS) centers in/near medically underserved areas. To better understand this challenge, an organizational assessment was conducted in early 2020 to identify and examine modifiable factors that may impede or facilitate immunization assessment and influenza vaccination at CBAS centers in Los Angeles County (LAC), California. METHODS: All 158 CBAS centers in LAC were asked to complete a 17-question survey. The survey asked about immunization assessment, gaps in communication with primary care providers, knowledge and use of the California Immunization Registry (CAIR), and institutional policies for influenza vaccination. In addition, the survey asked each center about its vaccination policy for staff and clients, including whether or not increasing vaccinations was an interest/priority for the center. Best subsets algorithms (regression models) were performed to identify factors that may influence CBAS centers' practices on immunization assessment and vaccination. RESULTS: Of the 158 centers, 101 (66 %) completed the survey. A majority did not conduct immunization assessments for influenza (n = 59; 58 %); nearly-two-thirds (n = 70; 71 %) reported it would be feasible to do so if the practice is integrated as part of the individualized/nursing plan of care. Best subsets algorithms showed the strongest factors influencing whether CBAS centers assess for influenza vaccination were: center size, staff training on CAIR, presence of barriers to vaccination, and the belief that it is the center's responsibility to conduct immunization assessments and vaccinations. CONCLUSIONS: Findings suggest that practice gaps in immunization assessment and influenza vaccination are common at LAC's CBAS centers. Closing these gaps may help LAC (and California) improve influenza vaccine uptake and other vaccinations (e.g., pneumococcal, COVID-19) among the most vulnerable of the state's aging populations, Medicare-Medicaid beneficiaries.