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Weekly influenza surveillance overview week 17: end of influenza season approaching in Europe

04 May 2012
Weekly influenza surveillance overview, week 17

The reported national influenza trends indicate that influenza season is now approaching its end in Europe, highlights the Weekly Influenza Surveillance Overview for Week 17.

The 2011–2012 influenza season started late and has been without any clear geographic progression. During week 17/2012, almost all countries reported low intensity and decreasing or stable trends.

Virological surveillance for week 17/2012 shows that of the 162 sentinel specimens tested, 19.1% were positive for influenza virus, continuing the downward trend observed since week 8/2012. As expected towards the end of the season, the proportion of B viruses continued to increase.

The A(H3N2) influenza viruses examined at the WHO Collaborating Centre in London show increasing evidence of an imperfect match between the circulating viruses and the current relevant vaccine antigen. This supports the WHO and EMA recommendation to modify the trivalent vaccines for the 2012/2013 Northern Hemisphere season.

Related links

See other influenza outputs on ECDC web portal:

  • 23 Apr 2012: Reproducibility of serology assays for influenza A(H1N1)2009pdm
  • 19 Apr 2012: Report on the association between the 2009 pandemic vaccine (Pandemrix®) and narcolepsy – Republic of Ireland
  • 13 Apr 2012: Lower than usual: early influenza vaccine effectiveness in parts of Europe in season 2011/12
  • 04 Apr 2012: Joint WHO-ECDC report on changes in pandemic preparedness plans: using lessons learnt to enhance preparedness
  • 04 Apr 2012: Controversial research on modifying A(H5N1) influenza viruses in the laboratory
  • 30 Mar 2012: Association of childhood narcolepsy and cataplexy and receipt of a pandemic influenza vaccine in Finland in 2009-10 – First papers in a peer review journal
  • 26 Mar 2012: Controversial research modifying A(H5N1) influenza viruses in the laboratory – Formal report of WHO technical consultation
  • 07 Mar 2012: Ferrets as experimental models of influenza in humans
  • 1 March 2012: WHO recommendation on influenza virus vaccines for the northern hemisphere 2012-2013 season
  • 1 March 2012: Overrepresentation of influenza A(H1N1)pdm09 virus among severe influenza cases in the 2011/12 season in four European countries
  • 1 March 2012: Enhanced monitoring of vaccine safety for 2009 pandemic vaccines
  • 29 Feb 2012: ECDC publishes its risk assessment on laboratory-created A(H5N1) viruses
  • 22 Feb 2012: How spread of the influenza A(H1N1)pdm09 pandemic was affected by school closures – Alberta, Canada
  • 21 Feb 2012: Oseltamivir-resistant influenza A(H1N1)pdm09 patterns across the globe: findings in Australia (season 2011) and United States (season 2010-11)
  • 6 Feb 2012: Facemasks and good hand hygiene to reduce influenza transmission in households – Cluster Randomised Controlled Trial in Germany 
  • 3 February 2012: Sentinel Surveillance for Severe Influenza in England (United Kingdom)
  • 17 January 2012: Application of Virological Risk Assessments: US Department of Health and Human Services (HHS) sponsors clinical trials of a vaccine targeted to a novel A(H3N2)v influenza strain
  • 17 January 2012: The importance of analyses of antigenic match and monitoring influenza vaccine effectiveness
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