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#Influenza–#Global #Update No. 284, based on data up to 19 February, 2017 (@WHO, summary)


Title: #Influenza–#Global #Update No. 284, based on data up to 19 February, 2017.

Subject: Human Influenza viruses, seasonal activity surveillance, weekly report.

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

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Influenza - Update No. 284, based on data up to 19 February, 2017



|-- Open map in new window jpg, 458kb –|



  • Influenza activity in the temperate zone of the northern hemisphere continued to be elevated in some countries.
    • Influenza activity in many countries especially in East Asia and Europe appeared to have already peaked.
    • Worldwide, influenza A(H3N2) virus was predominant.
    • The majority of influenza viruses characterized so far were similar antigenically to the reference viruses contained in vaccines for use in the 2016-2017 northern hemisphere influenza season.
    • Nearly all tested viruses collected recently for antiviral sensitivity were susceptible to the neuraminidase inhibitor antiviral medications.
  • In North America, influenza activity continued to increase.
    • Influenza - like illness and the number of influenza detections remain elevated in the United States of America with A(H3N2) and B viruses being detected.
    • Influenza activity plateaued in Canada and increased in Mexico with A(H3N2) virus and A(H1N1)pdm09 virus predominating, respectively.
  • In Europe, influenza activity remained elevated with influenza A (H3N2) virus being the most prominent subtype.
    • Detections of influenza B virus increased in the recent weeks.
    • Most of the countries reported stable or decreasing trends compared with previous weeks.
    • Persons aged over 65 years were reported most frequently associated with severe disease from influenza infection.
  • In East Asia, influenza activity appeared to be decreasing with influenza A(H3N2) virus predominant.
  • In Western Asia, influenza activity continued to decrease with influenza A(H3N2) and B viruses co-circulating in the region.
  • In Southern Asia, influenza activity continued to increase in India and Sri Lanka, with mainly influenza A(H1N1)pdm09 virus reported followed by influenza B virus.
  • In South East Asia, influenza activity remained low.
  • In Northern Africa, influenza activity continued to decrease; influenza A(H3N2) and influenza B virus detections were reported.
  • In West Africa, influenza activity continued to be reported in Côte d'Ivoire, Ghana and Niger, with influenza B being the main virus detected.
  • In the Caribbean countries and Central America, influenza and other respiratory virus activity remained low in general, except in Puerto Rico where influenza activity remained above the seasonal threshold with influenza A(H3N2) predominating.
    • In Jamaica, severe acute respiratory infection activity increased and peaked above the alert threshold.
  • In tropical South America, influenza and other respiratory virus activity remained low, although RSV activity remained elevated in Colombia.
  • In the temperate zone of the Southern Hemisphere, influenza activity was at inter-seasonal levels.


National Influenza Centres (NICs) and other national influenza laboratories from 91 countries, areas or territories reported data to FluNet for the time period from 06 February 2017 to 19 February 2017 (data as of 2017-03-03 11:02:59 UTC).

The WHO GISRS laboratories tested more than 187734 specimens during that time period.

45504 were positive for influenza viruses, of which 39002 (85.7%) were typed as influenza A and 6502 (14.3%) as influenza B.

Of the sub-typed influenza A viruses, 1085 (7.5%) were influenza A(H1N1)pdm09 and 13342 (92.5%) were influenza A(H3N2).

Of the characterized B viruses, 491 (65.2%) belonged to the B-Yamagata lineage and 262 (34.8%) to the B-Victoria lineage.

The vaccine recommendation for the 2017-2018 northern hemisphere influenza season was made and can be consulted at this link below:

Recommended composition of influenza virus vaccines for use in the 2017-2018 northern hemisphere influenza season: |-- Link to vaccine recommendation –|

Detailed influenza update: |—Download PDF pdf, 712kb –|

Seasonal update: |-- Seasonal influenza reviews –|


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

|-- Disease outbreak news –|


Keywords: WHO; Updates; Worldwide; Seasonal Influenza.