Influenza

Influenza update

08 September 2014 - Update number 219

Summary

Globally the influenza season is ongoing in the southern hemisphere. Elsewhere influenza activity remained low.

  • In Europe and North America, overall influenza activity remained at inter-seasonal levels.
  • In Africa (except the southern cone) and western Asia, influenza activity was low.
  • In eastern Asia, influenza activity remained low in most countries with influenza A(H3N2) the main detected virus subtype. Influenza A(H3N2) and some influenza B activity continued in south China.
  • In the southern hemisphere, the influenza season was ongoing. In the temperate zone of South America, influenza activity mainly associated with A(H3N2) virus decreased. In Australia and New Zealand, the influenza season was ongoing. Australia reported a sharp increase in activity associated with A(H1N1)pdm09 and A(H3N2) viruses in recent weeks with the highest number of influenza-like illness (ILI) rates and weekly notifications of influenza confirmed cases in the last 5 years. In South Africa the influenza season continued with A(H3N2) most frequently detected.
  • Based on FluNet reporting (as of 4 September 2014, 13:35 UTC), during weeks 33 to 34 (10 August 2014 to 23 August 2014), National Influenza Centres (NICs) and other national influenza laboratories from 51 countries, areas or territories reported data. The WHO GISRS laboratories tested more than 26 262 specimens. 3222 were positive for influenza viruses, of which 2632 (81.7%) were typed as influenza A and 590 (18.3%) as influenza B. Of the sub-typed influenza A viruses, 416 (17.8%) were influenza A(H1N1)pdm09 and 1920 (82.2%) were influenza A(H3N2). Of the characterized B viruses, 88 (98.9%) belonged to the B-Yamagata lineage and 1 (1.1%) to the B-Victoria lineage.

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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