Influenza

Influenza update

17 November 2014 - Update number 224

Summary

Globally, influenza activity remained low, with the exception of some Pacific Islands.

  • In North America, influenza activity continued to increase slightly but remained low.
  • In Europe overall influenza activity remained at inter-seasonal levels.
  • In tropical countries of the Americas, influenza detections remained low, with respiratory syncytial virus (RSV) causing most influenza-like illness (ILI) and severe acute respiratory infections (SARI) activity.
  • In Africa and western and eastern Asia, influenza activity was low.
  • In tropical Asia, influenza activity was low with influenza B predominant in Viet Nam.
  • In the southern hemisphere, influenza activity remained low except in several Pacific Islands where ILI activity remained high.
  • Based on FluNet reporting (as of 14 November 2014 13:40 UTC), during weeks 43 to 44 (19 October 2014 to 1 November 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 44 937 specimens. 1978 were positive for influenza viruses, of which 1434 (72.5%) were typed as influenza A and 544 (27.5%) as influenza B. Of the sub-typed influenza A viruses, 60 (6.9%) were influenza A(H1N1)pdm09 and 813 (93.1%) were influenza A(H3N2). Of the characterized B viruses, 87 (96.7%) belonged to the B-Yamagata lineage and 3 (3.3%) to the B-Victoria lineage.
  • Due to changes in data collection platforms, data from the WHO Regional Office for Europe are temporarily not available at the global level. Those data will be uploaded to FluNet and FluID as soon as possible. Information on European influenza activity can be found at http://www.flunewseurope.org/

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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