Influenza update

24 August 2015, - Update number 244, based on data up to 9 August 2015


Globally, influenza activity continued in the Southern hemisphere, with an increase in Oceania peaking in temperate South America and decreased activity in South Africa.

  • In the Northern hemisphere countries, respiratory virus activity remained low in general, and influenza activity continued at low, inter-seasonal levels. Influenza type A predominated in sporadic detections. A number of countries have also ceased or reduced surveillance activity during the inter-seasonal period.
  • In Eastern Africa, influenza activity remained at low levels. In countries with reported influenza activity, type A predominated. In Western Africa, influenza activity decreased overall, with influenza B predominating in Ghana, and influenza A in Cote d’Ivoire. In tropical countries of the Americas, Central America and the Caribbean, influenza activity remained at low levels, with the exception of Cuba, where high levels of influenza-like illness (ILI) and severe acute respiratory infections (SARI) were reported, associated with influenza A(H1N1)pdm09 and RSV detections.
  • In tropical Asia, countries in Southern Asia and South East Asia reported an overall decrease in influenza activity. Influenza activity was still high but decreasing in southern China with influenza A(H3N2) predominating.
  • In temperate South America, ILI and SARI activity was peaking or had peaked mainly due to RSV activity. Overall, influenza activity this season was mild with respect to previous seasons. Influenza type A predominated, with type A(H1N1)pdm09 and type A(H3N2) co-circulating.
  • In South Africa, influenza activity decreased, with influenza type B predominating in recent weeks.
  • In Australia and New Zealand, influenza activity seemed to be still increasing with predominantly influenza B followed by influenza A(H3N2) detections.
  • National Influenza Centres (NICs) and other national influenza laboratories from 69 countries, areas or territories reported data to FluNet for the time period from 13 July 2015 to 26 July 2015* (data as of 2015-08-06 12:04:14 UTC).The WHO GISRS laboratories tested more than 29591 specimens during that time period. 2699 were positive for influenza viruses, of which 2242 (83.1%) were typed as influenza A and 457 (16.9%) as influenza B. Of the sub-typed influenza A viruses, 61 (2.7%) were influenza A(H1N1)pdm09 and 2232 (97.3%) were influenza A(H3N2). Of the characterized B viruses, 143 (91.1%) belonged to the B-Yamagata lineage and 14 (8.9%) to the B-Victoria lineage.

Detailed influenza update

Influenza surveillance outputs

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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