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#Update: Increase in #Human #Infections with #Avian #Influenza #H7N9 Viruses During the 5th #Epidemic — #China, Oct. ‘16–Aug. 7 ‘17 (@CDCgov, edited)

Title : #Update: Increase in #Human #Infections with #Avian #Influenza #H7N9 Viruses During the 5th #Epidemic — #China, Oct. ‘16–Aug. 7 ‘17....

11 Jul 2017

#Influenza #Update No. 293, based on data up to 25 June 2017 (@WHO, summary)

Title: #Influenza #Update No. 293, based on data up to 25 June 2017.

Subject: Human Influenza Viruses, global activity surveillance, current situation.

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

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Influenza Update No. 293, based on data up to 25 June 2017



|-- Open map in new window jpg, 447kb –|


    • In the temperate zone of the southern hemisphere, influenza activity continued to increase, especially in temperate South America.
    • 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 in most countries in recent weeks.
  • In temperate South America, influenza like illness (ILI) and SARI activities continued to increase in Chile (ILI was reported to be above the alert threshold), Paraguay and Uruguay following seasonal patterns and decreased slightly in Argentina.
    • Influenza activity continued to increase in Argentina, Chile, Paraguay and Uruguay.
    • In Brazil, SARI activity and influenza detections seemed to have peaked.
    • Influenza A(H3N2) viruses predominated in the region with some B virus activity reported as well.
  • In Oceania, seasonal influenza activity in Australia and New Zealand increased from baseline to average levels, with both influenza A and B co-circulating.
    • In New Zealand, of the influenza A viruses subtyped, A(H3N2) viruses predominated and viruses of the Yamagata lineage predominated among the B viruses characterized.
    • Nevertheless, influenza detection rates remained low and at inter-seasonal levels in all territories.
  • 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 and Central America countries, respiratory virus activity remained low in most countries with a few exceptions.
    • There has been an increasing trend of detections of predominantly influenza A(H3N2) viruses in Cuba and El Salvador and detections of predominantly influenza B viruses in Costa Rica and Nicaragua over the past few weeks.
    • Increased acute respiratory infections (ARI), SARI and pneumonia cases 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 and Ghana.
    • In Eastern Africa, influenza activity appeared to decrease in the Republic of Mauritius after a peak in week 23.
    • In both influenza transmission-zones, A(H1N1)pdm09 and A(H3N2) viruses co-circulated.
  • In Southern Asia, low levels of influenza activity continued to be reported.
    • Bangladesh reported increased activity with A(H1N1)pdm09 through week 21, but there have not been further updates.
    • Sri Lanka reported detections of A(H3N2) and B viruses in the past few weeks.
  • In South East Asia, influenza activity continued to increase in some countries and decreased in other countries.
    • In Singapore, ILI and influenza activity continued to be reported, with influenza A(H3N2) and B viruses predominant.
    • Increased influenza activity was reported in Thailand [with A(H1N1)pdm09 and A(H3N2) viruses co-circulating], and the Philippines where A(H1N1)pdm09 viruses were predominant.
    • ILI and influenza activity increased slightly over the past few weeks in Southern China (with detections of all seasonal subtypes) and in Hong Kong, SAR, China, with detections of predominantly influenza A(H3N2) viruses.
  • 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, only one influenza virus detection was reported in week 24. Decreasing trends of SARI activity were reported in Armenia and Georgia.
  • In Central Asia, there were no updated reports on virus detections or respiratory illness indicators.
  • In East Asia, Japan, Mongolia and the Republic of Korea each reported a few detections of influenza B viruses; Japan also reported occassional influenza A(H3N2) detections. Very little activity was reported in Northern China.


National Influenza Centres (NICs) and other national influenza laboratories from 83 countries, areas or territories reported data to FluNet for the time period from 12 June 2017 to 25 June 2017 (data as of 2017-07-07 03:57:22 UTC).

The WHO GISRS laboratories tested more than 56574 specimens during that time period. 5109 were positive for influenza viruses, of which 4101 (80.3%) were typed as influenza A and 1008 (19.7%) as influenza B.

Of the sub-typed influenza A viruses, 447 (14.3%) were influenza A(H1N1)pdm09 and 2688 (85.7%) were influenza A(H3N2).

Of the characterized B viruses, 165 (49.4%) belonged to the B-Yamagata lineage and 169 (50.6%) to the B-Victoria lineage.


Detailed influenza update: |—Download PDF pdf, 686kb –|

Seasonal update: |-- Seasonal influenza reviews –|


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

|-- Disease outbreak news –|


Keywords: WHO; Updates; Worldwide; Seasonal Influenza.