Early estimates of influenza vaccine effectiveness in Navarre, Spain: 2012/13 mid-season analysis

J Castilla, I Martinez-Baz, V Martinez-Artola, M Fernandez-Alonso, G Reina, M Guevara, M Garcia Cenoz, F Elia, N Alvarez, A Barricarte, C Ezpeleta
2013 Eurosurveillance  
We present estimates of influenza vaccine effectiveness (VE) in Navarre, Spain, in the early 2012/13 season, which was dominated by influenza B. In a population-based cohort using electronic records from physicians, the adjusted VE in preventing influenzalike illness was 32% (95% confidence interval (CI): 15 to 46). In a nested test-negative case-control analysis the adjusted VE in preventing laboratory-confirmed influenza was 86% (95% CI: 45 to 96). These results suggest a high protective
more » ... igh protective effect of the vaccine.
pmid:23449182 fatcat:7e4yfkcisfcolfmnmdmtjlmuse