First estimates of influenza vaccine effectiveness among severe influenza cases, France, 2011/12

I Bonmarin; E Belchior; Y Le Strat; D Lévy-Bruhl

doi:10.2807/ese.17.18.20163-en

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First estimates of influenza vaccine effectiveness among severe influenza cases, France, 2011/12

I Bonmarin¹, E Belchior¹, Y Le Strat¹, D Lévy-Bruhl¹
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Affiliations: ¹ Département des maladies infectieuses, Institut de veille sanitaire, Saint-Maurice, France

Correspondence:
I Bonmarin
i.bonmarin invs.sante.fr
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Citation style for this article: Bonmarin I, Belchior E, Le Strat Y, Lévy-Bruhl D. First estimates of influenza vaccine effectiveness among severe influenza cases, France, 2011/12. Euro Surveill. 2012;17(18):pii=20163. https://doi.org/10.2807/ese.17.18.20163-en Received: 30 Mar 2012

Abstract

Following a suspected virus-vaccine mismatch, the screening method was used to estimate in almost real time the influenza vaccine effectiveness (VE) against severe cases in high-risk individuals. Data on vaccination status were provided by the influenza severe surveillance system and data on vaccination coverage by the National Social Security Scheme. The analysis showed a decline of the vaccine effectiveness in 2011/12 (VE: 30% (95% CI: 22-39)) compared to 2010/11 (VE: 53% (95% CI: 40-67)).