La grippe représente une menace d’infection pour les travailleurs de la santé (TS) et un risque de transmission nosocomiale. L’adhésion soutenue à la vaccination annuelle contre la grippe saisonnière est importante pour le contrôle des épidémies.
Background Influenza poses infection threats to healthcare workers (HCW) and the risk of nosocomial transmission. Sustained adherence to seasonal influenza vaccination uptake annually is important in epidemic control. Aim To assess the adherence pattern of nurses to seasonal influenza vaccination over five years and its associated factors. Methods A cross-sectional study was conducted among nurses after the winter influenza season in Hong Kong in March 2019. Based on the influenza vaccine uptakes in the 2014/15-2018/19 seasons, respondents were stratified into three groups: “full adherence”(5 uptakes), “partial adherence”(1-4) and “non-adherence”(0). Stepwise multivariable logistic regression was performed to determine the associations between adherence to annual influenza vaccination, respondents’ characteristics and considerations for vaccination. Findings Of 1,306 nurses recruited, a majority were female (88%), with a median age of 36 years (IQR 30-46). Influenza vaccination uptake rate increased from 36% in the 2014/15 to 47% in the 2018/19 season. After stratification, 39%, 40% and 21% were non-, partial and full adherers respectively. Full adherence was significantly associated with female (adjusted odds ratio [aOR] 0.60), aged 40 or over (aOR 2.92), long-term care facility nurse (aOR 0.56) and uptake during studentship (aOR 3.83), local prevalence of seasonal influenza (aOR 0.51), and expert opinion (aOR 4.04). Conclusions This study identified a limited proportion of nurses being fully adherent to seasonal influenza vaccination. Monitoring adherence, improving access to vaccine and intervention tailored to the less adherent HCWs are crucial.