Influenza

Influenza update

14 July - Update number 215

Summary

Globally influenza activity remained low, with gradual increase of influenza activity in the southern hemisphere, however in Chile influenza activity was relatively high.

  • In North America and Europe, overall influenza activity remained at inter-seasonal levels.
  • In eastern Asia, influenza activity reached inter-seasonal levels in most countries with influenza A(H3N2) and influenza B virus predominating, although influenza activity was still slightly increasing in the south region of China, mainly due to influenza A(H3N2) viruses.
  • In southern and south-eastern Asia, influenza activity continued to decline, except for Singapore that showed a sustained increase in influenza detection rates, even while the rate for influenza-like illness (ILI) activity and acute respiratory infections remained low.
  • In northern Africa and western Asia, influenza activity remained low.
  • In the southern hemisphere, influenza activity increased but was generally at a low level, except for Chile which showed influenza activity similar to last year’s peak, with mainly influenza A(H3N2) detections. In South Africa the influenza detection rate increased mainly due to influenza A(H3N2).
  • Based on FluNet reporting (as of 14 July 2014, 14:55 UTC), during weeks 25 to 26 (15 June 2014 to 28 June 2014), National Influenza Centres (NICs) and other national influenza laboratories from 70 countries, areas or territories reported data. The WHO GISRS laboratories tested more than 29 795 specimens. 2748 were positive for influenza viruses, of which 2230 (81.2%) were typed as influenza A and 517 (18.8%) as influenza B. Of the sub-typed influenza A viruses, 257 (12.9%) were influenza A(H1N1)pdm09 and 1740 (87.1%) were influenza A(H3N2). Of the characterized B viruses, 123 (93.9%) belong to the B-Yamagata lineage and 8 (6.1%) to the B-Victoria lineage.

Full influenza update

2013/21014 northern hemisphere winter influenza season review


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.

Share

If you wish to be notified when this page is updated send an e-mail to fluupdate@who.int