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30 May 2017

#Influenza – #Update No. 290, based on data up to 14 May 2017 (@WHO, May 29 ‘17, summary)

Title: #Influenza – #Update No. 290, based on data up to 14 May 2017.

Subject: Human Influenza Viruses, activity surveillance across the globe.

Source: World Health Organization (WHO), full page: (LINK). Summary.

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Influenza – Update No. 290, based on data up to 14 May 2017



|-- Open map in new window jpg, 452kb –|


    • In the temperate zone of the southern hemisphere, influenza activity started to increase slowly but remained low in general.
    • Influenza activity in the temperate zone of the northern hemisphere continued to decrease.
    • Worldwide, influenza B viruses were predominant.
  • In temperate South America, low influenza activity was reported, with co-circulation of influenza A(H3N2) and B viruses.
  • In southern Africa influenza activity is still below seasonal threshold.
  • In Oceania, influenza activity was still low in Australia and New Zealand.
    • A few detections of influenza A(H3N2) and A(H1N1)pdm09 were reported.
  • In tropical South America, influenza activity remained low in most of the region, with influenza A(H3N2) and B viruses predominating.
  • In the Caribbean and central American countries, respiratory virus activity remained low.
  • In eastern Asia, decreasing trends of influenza activity were reported, with all seasonal influenza subtypes detected in the region.
  • In southern Asia, influenza activity continued to decrease.
  • In western Asia, influenza activity was low in general.
  • In south-east Asia, influenza activity remained low in general, with all seasonal influenza subtypes present in the region.
  • In western Africa, few influenza detections were reported in with all seasonal influenza subtypes co-circulating in the region.
    • In eastern Africa, influenza activity was reported in Kenya, Madagascar, Republic of Mauritius, and the United Republic of Tanzania with influenza A(H3N2) viruses predominant in the region.
  • In northern Africa, sporadic detections of all seasonal influenza subtypes were reported in recent weeks.
  • In Europe, influenza activity was low in general.
    • In northern and eastern Europe, low levels of influenza B virus detections were reported.
    • Little to no influenza activity was reported in south-west Europe.
  • In central Asia, available reports on respiratory illness indicators indicated low activity.
  • In North America, influenza activity continued to decrease overall.


National Influenza Centres (NICs) and other national influenza laboratories from 85 countries, areas or territories reported data to FluNet for the time period from 01 May 2017 to 14 May 2017 (data as of 2017-05-26 04:23:12 UTC).

The WHO GISRS laboratories tested more than 63766 specimens during that time period.

5518 were positive for influenza viruses, of which 2655 (48.1%) were typed as influenza A and 2863 (51.9%) as influenza B.

Of the sub-typed influenza A viruses, 1038 (51.2%) were influenza A(H1N1)pdm09 and 990 (48.8%) were influenza A(H3N2).

Of the characterized B viruses, 190 (30.1%) belonged to the B-Yamagata lineage and 442 (69.9%) to the B-Victoria lineage.


Detailed influenza update: |—Download PDF pdf, 650kb –|

Seasonal update: |-- Seasonal influenza reviews –|


|-- Influenza at the Human-Animal Interface (HAI) –|

|-- Disease outbreak news –|


Keywords: WHO; Updates; Seasonal Influenza; Worldwide.