Influenza

Influenza update

10 March 2014 - Update number 206

Summary

  • In North America, influenza activity continued to decrease overall, but remained elevated in some regions. Influenza A(H1N1)pdm09 continued as the predominant circulating virus, and influenza B detections increased slightly throughout the region.
  • In Europe, influenza activity was variable between countries. Overall trends showed slight increases in activity in the northern and eastern regions, and decreases in the southwestern region. Influenza A(H1N1)pdm09 and A(H3N2) continued to circulate with variable predominance among countries.
  • In Eastern Asia, influenza A(H1N1)pdm09 remained predominant and trends were inconsistent. Influenza activity in China began to decrease while activity in Mongolia continued to increase.
  • In Tropical Asia, influenza activity was largely decreased, however Thailand reported increasing influenza A(H1N1)pdm09 activity.
  • In Northern Africa and Western Asia, influenza activity varied, with Egypt continuing to report high activity of influenza A(H1N1)pdm09.
  • Based on FluNet reporting (as of 4 March 2014, 12:15 UTC), during weeks 7 to 8 (9 February 2014 to 22 February 2014), National Influenza Centres (NICs) and other national influenza laboratories from 80 countries, areas or territories reported data. The WHO GISRS laboratories tested more than 80 809 specimens. 16 409 were positive for influenza viruses, of which 13 869 (84.5%) were typed as influenza A and 2540 (15.5%) as influenza B. Of the sub-typed influenza A viruses, 6283 (70.6%) were influenza A(H1N1)pdm09 and 2612 (29.4%) were influenza A(H3N2). Of the characterized B viruses, 124 (84.9%) belonged to the B-Yamagata lineage and 22 (15.1%) 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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