Influenza

Influenza update

2 June - Update number 212

Summary

Globally the influenza activity was at inter-seasonal levels in most countries

  • In North America, influenza levels were at inter-seasonal levels with influenza B circulation still detected.
  • In Europe, influenza activity remained at inter-seasonal levels in most countries.
  • In eastern Asia, influenza activity approached interseasonal levels in most countries with influenza B virus predominating at low levels.
  • In southern and south-eastern Asia, influenza activity continued to decline in most countries, except the Islamic Republic of Iran where a slight increase was observed. In northern Africa and western Asia, influenza activity remained low in most countries.
  • In the southern hemisphere, influenza activity remained low, although in some of the countries in the temperate zone of South America increase in ILI activity with small increas in influenza detections was observed.
  • Based on FluNet reporting (as of 2 June 2014, 12:25 UTC), during weeks 19 to 20 (4 May 2014 to 17 May 2014), National Influenza Centres (NICs) and other national influenza laboratories from 86 countries, areas or territories reported data. The WHO GISRS laboratories tested more than 31 706 specimens. 2920 were positive for influenza viruses, of which 1417 (48.5%) were typed as influenza A and 1503 (51.5%) as influenza B. Of the sub-typed influenza A viruses, 241 (29.8%) were influenza A(H1N1)pdm09 and 568 (70.2%) were influenza A(H3N2). Of the characterized B viruses, 32 (94.1%) belong to the B-Yamagata lineage and 2 (5.9%) to the B-Victoria lineage.

Full influenza update


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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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