Coverage and predictors of vaccination against 2012/13 seasonal influenza in Madrid, Spain Analysis of population-based computerized immunization registries and clinical records

We aim to determine 2012-13 seasonal influenza vaccination coverage. Data were analyzed by age group and by coexistence of concomitant chronic conditions. Factors associated with vaccine uptake were identified. We also analyze a possible trend in vaccine uptake in post pandemic seasons. We used computerized immunization registries and clinical records of the entire population of the Autonomous Community of Madrid, Spain (6 284 128 persons) as data source. A total of 871 631 individuals were vaccinated (13.87%). Coverage for people aged >= 65 years was 56.57%. Global coverage in people with a chronic condition was 15.7% in children and 18.69% in adults aged 15-59 years. The variables significantly associated with a higher likelihood of being vaccinated in the 2012-13 campaign for the age groups studied were higher age, being Spanish-born, higher number of doses of seasonal vaccine received in previous campaigns, uptake of pandemic vaccination, and having a chronic condition. We conclude that vaccination coverage in persons aged <60 years with chronic conditions is less than acceptable. The very low coverage among children with chronic conditions calls for urgent interventions. Among those aged >= 60 years, uptake is higher but still far from optimal and seems to be descending in post-pandemic campaigns. For those aged >= 65 years the mean percentage of decrease from the 2009/10 to the actual campaign has been 12%. Computerized clinical and immunization registers are useful tools for providing rapid and detailed information about influenza vaccination coverage in the population.