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25 Jul 2017

#Influenza – #Global #Update No. 294, based on data up to 09 July 2017 (@WHO, summary)

Title: #Influenza – #Global #Update No. 294, based on data up to 09 July 2017.

Subject: Human Influenza Viruses, global activity surveillance, weekly report.

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

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Influenza update – Update No. 294, based on data up to 09 July 2017



|-- Open map in new window jpg, 448kb –|


    • In the temperate zone of the southern hemisphere, high levels of influenza activity continued to be reported.
    • A few countries in Central America, the Caribbean and South East Asia also reported increased influenza activity.
    • Influenza activity in the temperate zone of the northern hemisphere was reported at low levels.
    • Worldwide, influenza A(H3N2) and B viruses co-circulated.
  • In the temperate zone of the Southern Hemisphere, influenza activity increased or peaked in most countries in recent weeks.
  • In temperate South America, influenza activity remained high but appeared to have peaked in most of the countries.
    • In Uruguay, severe acute respiratory infection and influenza activities continued to increase.
    • Influenza A(H3N2) viruses predominated in the region with some B virus activity reported as well.
  • In Oceania, seasonal influenza activity continued to increase, with influenza A(H3N2) and B viruses present in the region.
    • In Australia, influenza activity was following the seasonal pattern.
    • An increasing trend of ILI and SARI activities was reported in New Zealand in recent weeks, with influenza like illness (ILI) remaining just above the seasonal threshold level.
    • Influenza activity also increased with influenza A(H3N2) and B Yamagata lineage viruses predominantly detected.
    • Other respiratory virus activity remained stable.
  • In Southern Africa, seasonal activity continued to increase with influenza A(H3N2) being the most detected subtype followed by A(H1N1)pdm09.
  • In the Caribbean, respiratory virus activity remained low in most countries with the exception of Cuba reporting an increase of influenza A(H3N2) viruses and RSV detections in recent weeks.
    • In Central America, influenza activity continued to increase in El Salvador and Honduras, and in Costa Rica and Nicaragua with influenza A(H3N2) and B viruses detected, respectively.
    • Increasing trends of acute respiratory infections (ARI), SARI and pneumonia were reported in El Salvador as well.
  • In tropical South America, influenza activity remained low.
  • In Western Africa, few influenza detections were reported in Côte d’Ivoire, Ghana, Senegal and Togo.
    • In Eastern Africa, influenza activity continued to decrease.
    • In both influenza transmission zones, influenza A(H1N1)pdm09 and A(H3N2) viruses co-circulated.
  • In Southern Asia, low levels of influenza activity continued to be reported, with influenza A(H1N1) virus predominant.
  • In South East Asia, influenza activity continued to increase in some countries and decreased in other countries.
    • In Singapore, ILI and influenza activity appeared to decrease after peaking in week 20, with influenza A(H3N2) viruses predominant.
    • Increased influenza activity was reported in Thailand, with all seasonal influenza subtypes co-circulating.
    • In the Philippines, influenza detections appeared to decrease with influenza A(H1N1)pdm09 viruses predominant.
    • ILI and influenza activity continued to increase in Southern China and to a high level in Hong Kong, SAR, China, with detections of predominantly influenza A(H3N2) viruses.
    • Increased SARI activity was also reported in Hong Kong, SAR, China.
  • In North America, little to no influenza activity was reported.
  • In Europe, little to no influenza activity was reported.
  • In Northern Africa, no influenza virus detections were reported.
  • In Western Asia, a few influenza virus detections were reported in recent weeks.
    • SARI activity continued to decrease in Armenia and Georgia.
  • In Central Asia, there were no updated reports on virus detections or respiratory illness indicators.
  • In East Asia, influenza activity remained low. A few detections of influenza A(H3N2) viruses were reported in Northern China and Republic of Korea.


National Influenza Centres (NICs) and other national influenza laboratories from 68 countries, areas or territories reported data to FluNet for the time period from 26 June 2017 to 09 July 2017 (data as of 2017-07- 20 15:26:16 UTC).

The WHO GISRS laboratories tested more than 50 673 specimens during that time period.

6764 were positive for influenza viruses, of which 5983 (88.5%) were typed as influenza A and 781 (11.5%) as influenza B.

Of the sub-typed influenza A viruses, 680 (12.5%) were influenza A(H1N1)pdm09 and 4762 (87.5%) were influenza A(H3N2).

Of the characterized B viruses, 177 (58%) belonged to the B-Yamagata lineage and 128 (42%) to the B-Victoria lineage.


Detailed influenza update: |—Download PDF pdf, 603kb –|

Seasonal update: |-- Seasonal influenza reviews –|


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

|-- Disease outbreak news –|


Keywords: WHO; Updates; Worldwide; Seasonal Influenza.