Influenza

Influenza update

24 February 2014 - Update number 205

Summary

  • In North America, influenza A(H1N1)pdm09 virus remained predominant. Influenza activity continued decreasing in Canada, Mexico and the United States of America, but remained at elevated levels.
  • In Europe, overall influenza activity remained elevated. Trends suggests the wave of influenza activity is moving from south to north overall, with both influenza A viruses circulating.
  • In Eastern Asia, influenza activity remained high with influenza A(H1N1)pdm09 predominant.
  • In Northern Africa and Western Asia, influenza activity was variable, with Egypt reporting high activity of influenza A(H1N1)pdm09 and increased number of severe cases.
  • Based on FluNet reporting (as of 24 February 2014, 08:20 UTC), during weeks 5 to 6 (26 January 2014 to 8 February 2014, National Influenza Centres (NICs) and other national influenza laboratories from 93 countries, areas or territories reported data. The WHO GISRS laboratories tested more than 87 378 specimens. 20 777 were positive for influenza viruses, of which 18 487 (89%) were typed as influenza A and 2290 (11%) as influenza B. Of the sub-typed influenza A viruses, 9141 (77%) were influenza A(H1N1)pdm09, 2735 (23%) were influenza A(H3N2) and 1 (0%) was influenza A(H5N1). Of the characterized B viruses, 127 (74.7%) belong to the B-Yamagata lineage and 43 (25.3%) to the B-Victoria lineage.
  • The WHO Consultation and Information Meeting on the Composition of Influenza Virus Vaccines for the Northern Hemisphere 2014-2015 took place and the recommendations are posted at the WHO website: see below

Full influenza update


For regional updates on influenza see the following links


For updates on the influenza at the human-animal interface see the following WHO web pages:


Source of data

The Global Influenza Programme monitors influenza activity worldwide and publishes an update every two weeks.
The updates are based on available epidemiological and virological data sources, including FluNet (reported by the WHO Global Influenza Surveillance and Response System) and influenza reports from WHO Regional Offices and Member States. Completeness can vary among updates due to availability and quality of data available at the time when the update is developed.

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