Influenza update

16 November 2015, - Update number 250, based on data up to 01 November, 2015


Globally, influenza activity generally remained low in both hemispheres.

  • In the Northern Hemisphere, influenza activity continued at low, inter-seasonal levels with sporadic detections.
  • Few influenza virus detections were reported by countries in Africa.
  • In tropical countries of the Americas, Central America and the Caribbean, influenza activity remained at low levels, with the exception of Cuba, where high numbers of severe acute respiratory infections (SARI), associated with influenza A(H1N1)pdm09 virus and RSV, continued to be reported. In Colombia, acute respiratory activity (ARI) again remained slightly elevated with ongoing RSV and influenza A(H3N2) detections.
  • In western Asia, Bahrain and Qatar reported increased influenza activity, predominantly due to influenza A (H1N1)pdm09.
  • In tropical Asia, countries in Southern and South East Asia reported low influenza activity overall except India, Lao People’s Democratic Republic and Thailand where activity mainly due to A(H1N1)pdm09 virus continued to be reported. Influenza activity declined in southern China. Iran reported increased influenza detections, mostly due to influenza A(H3N2).
  • In temperate South America, respiratory virus activity continued to decrease in recent weeks. In Chile, ILI activity decreased but remained above expected levels in recent weeks with decreased detections of influenza viruses and RSV.
  • In Australia, New Zealand, and South Africa, influenza activity continued to decrease to low levels of virus detections with the end of the influenza season in these countries.
  • National Influenza Centres (NICs) and other national influenza laboratories from 87 countries, areas or territories reported data to FluNet for the time period from 19 October 2015 to 01 November 2015* (data as of 2015-11-12 13:57:25 UTC).The WHO GISRS laboratories tested more than 52883 specimens during that time period. 1343 were positive for influenza viruses, of which 1049 (78.1%) were typed as influenza A and 294 (21.9%) as influenza B. Of the sub-typed influenza A viruses, 517 (68.2%) were influenza A(H1N1)pdm09 and 241 (31.8%) were influenza A(H3N2). Of the characterized B viruses, 42 (53.2%) belonged to the B-Yamagata lineage and 37 (46.8%) to the B-Victoria lineage.

Detailed influenza update

Seasonal 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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