Early #influenza #vaccine #effectiveness #results 2015-16: I-MOVE multicentre case-control study (@eurosurveillanc, edited)

[Source: Eurosurveillance, full page: (LINK). Edited.]

Eurosurveillance, Volume 21, Issue 6, 11 February 2016  / News

Early influenza vaccine effectiveness results 2015-16: I-MOVE multicentre case-control study [      ]

E Kissling 1, M Valenciano 1

Author affiliations: 1. EpiConcept, Paris, France

Correspondence: Esther Kissling ( e.kissling@epiconcept.fr)

Citation style for this article: Kissling E, Valenciano M. Early influenza vaccine effectiveness results 2015-16: I-MOVE multicentre case-control study. Euro Surveill. 2016;21(6):pii=30134. DOI: http://dx.doi.org/10.2807/1560-7917.ES.2016.21.6.30134


On 11 February 2016, the Influenza Monitoring Vaccine Effectiveness in Europe (I-MOVE) published the 2015–16 interim vaccine effectiveness (VE) estimates against influenza from a multi-centre case control study in 10 study sites: Germany, France, Hungary, Ireland, Italy, Poland, Portugal, Spain, Sweden and the Netherlands, on their website [1].

Adjusted VE interim results against any influenza among all ages were at 46.3% (95% confidence interval (CI): 4.9–69.7%) and 45.2% (95% CI: -12.5–73.3%) among the 18–64 year olds. Among those aged 65 years and older, there were only 14 influenza cases in the study. The adjusted VE against influenza A(H1N1)pdm09 was at 44.2% (95% CI: -3.1–69.8%) among all ages and thus lower compared with end of season estimates published in previous years (55.5% in 2010–11, 50.4% in 2012–13; 47.5% in 2013–14, 54.2% in 2014–15).

Early season influenza VE was measured against medically-attended laboratory-confirmed influenza from week 41/2015 to week 3/2016 using a test-negative design as described in the I-MOVE generic protocol [2] and in the I-MOVE multicentre case–control publications [3]. Some 1,933 influenza-like illness patients among whom 348 were positive to influenza were included: four cases of influenza A not subtyped, 246 A(H1N1)pdm09, 21 A(H3N2), and 77 influenza B cases. Among the 37 influenza B cases where lineage was available, 36 (97.3%) were of the Victoria lineage, a lineage not included in the trivalent vaccine.

For this interim analysis, there was no information on genetic characterisation of the viruses. The recently published European Centre for Disease Prevention and Control risk assessment [4] reported that all A(H1N1)pdm09 viruses characterised in the European Union up to week three belonged to the 6B subgroup.

The interim estimates should be interpreted with caution. The 2015–16 season started late in the participating countries and the sample size for these interim estimates is low, resulting in low precision. The final estimates will be available at the end of the influenza season.

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1) Influenza Monitoring Vaccine Effectiveness in Europe (I-MOVE). Interim 2015-16 influenza vaccine effectiveness results, I-MOVE multicentre case-control study. I-MOVE; 2016. Available from: https://sites.google.com/site/epiflu/Home/2015-16-interim-results

2) European Centre for Disease Prevention and Control (ECDC). Protocol for case control studies to measure pandemic and seasonal vaccine effectiveness in the European Union and European Economic Area. Stockholm: ECDC; 2010. Available from: http://www.ecdc.europa.eu/en/publications/Publications/0907_TED_Influenza_AH1N1_Measuring_Influenza_Vaccine_Effectiveness_Protocol_Case_Control_Studies.pdf

3) Influenza Monitoring Vaccine Effectiveness in Europe (I-MOVE). I-MOVE website list of publications 2007-2015. I-MOVE; 2016. Available from: https://sites.google.com/site/epiflu/list-of-i-move-publications

4) European Centre for Disease Prevention and Control (ECDC). Risk Assessment: Seasonal influenza 2015-16 in the EU/EEA countries. Stockholm: ECDC; 2016. Available from: http://ecdc.europa.eu/en/publications/Publications/seasonal-influenza-risk-assessment-2015-2016.pdf

Keywords: Research; European Region; Seasonal Influenza; H1N1pdm09; Vaccines.


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Giuseppe Michieli

I am an Italian blogger, active since 2005 with main focus on emerging infectious diseases such as avian influenza, SARS, antibiotics resistance, and many other global Health issues. Other fields of interest are: climate change, global warming, geological and biological sciences. My activity consists mainly in collection and analysis of news, public services updates, confronting sources and making decision about what are the 'signals' of an impending crisis (an outbreak, for example). When a signal is detected, I follow traces during the entire course of an event. I started in 2005 my blog ''A TIME'S MEMORY'', now with more than 40,000 posts and 3 millions of web interactions. Subsequently I added an Italian Language blog, then discontinued because of very low traffic and interest. I contributed for seven years to a public forum (FluTrackers.com) in the midst of the Ebola epidemic in West Africa in 2014, I left the site to continue alone my data tracking job.