Influenza Vaccination Coverage of Healthcare Workers in Nursing Homes in France and Related Determinants, 2018- 2019 Season: A Cross-Sectional Survey

Abstract Background The burden of influenza morbidity and mortality in nursing homes (NH) is high. Vaccination of residents and healthcare workers (HCW) is the main prevention strategy. Despite recommendations, HCW vaccination coverage is generally low. Methods We performed a nationwide cross-sectional survey of NH using a single-stage stratified random sampling design to estimate influenza vaccination coverage in nursing home HCW in France during the 2019-2020 season, and to identify measures likely to increase it. A multivariate analysis was performed using a negative binomial regression. Results Overall influenza vaccination coverage in HCW was 31.9% (95% CI [29.7-34.1]). It varied according to occupational category: 75.5% [69.3-81.7] for physicians, 42.9% [39.4-46.4] for nurses, 26.7% [24.5-29.0] for nursing assistants, and 34.0% [30.1-38.0] for other paramedical personnel. When considering all professionals (i.e., HCW and non-medical professionals), overall vaccination coverage was 30.6% [28.2-33.0]. Vaccination coverage was higher in private nursing homes, in i) small nursing homes, ii) when vaccination was offered free of charge (RRa: 1.4, [1.1-1.8]), iii) when vaccination promotion for professionals included individual (RRa: 1.6 [1.1-2.1]) or collective (RRa: 1.3 [1.1-1.5]) information sessions, videos or games (RRa: 1.4 [1.2-1.6], iv) when information on influenza vaccines was provided (RRa: 1.2 [1.0-1.3], and finally, vi) when a vaccination point of contact - defined as an HCW who could provide reliable information on vaccination - was nominated within the nursing home (RRa: 1.7 [1.3-2.2]). Conclusions Urgent and innovative actions are required to increase coverage in HCW. Vaccination programmes should include free vaccination and education campaigns, and particularly target nursing assistants. The results of this nationwide study provide keys for improving influenza vaccination coverage in HCW. Programmes should ensure that information on influenza vaccines is provided by a vaccination point of contact in NH using attractive media. Combining the different prevention measures proposed could increase coverage in NH nationwide by over 50%.