Surveillance and outbreak reports Open Access
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We defined a cohort of people with major chronic conditions (152,585 subjects) in Navarre, Spain, using electronic records from physicians, to obtain 2010/11 mid-season estimates of influenza vaccine effectiveness. The adjusted estimates of the effectiveness of the 2010/11 trivalent influenza vaccine were 31% (95% confidence interval (CI): 20-40%) in preventing medically attended influenza-like illness, and 58% (95% CI: 11-80%) in preventing laboratory-confirmed influenza. Having received the monovalent influenza A(H1N1)2009 vaccine in the 2009/10 season had an independent preventive effect against medically attended influenza-like illness (17%, 95% CI: 1-30%), and having received both vaccines had 68% (95% CI: 23-87%) effectiveness in preventing laboratory-confirmed influenza.


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