Influenza

Influenza update - 277

28 November 2016, - Update number 277, based on data up to 13 November, 2016

Summary

Influenza activity in the temperate zone of the northern hemisphere has not yet picked up and remained at inter-seasonal levels. Influenza activity in temperate southern hemisphere countries was back at inter-seasonal levels.

  • In North America and Europe, influenza activity was still low with few influenza virus detections and influenza-like illness (ILI) levels below seasonal thresholds. In the United States, respiratory syncytial virus (RSV) activity continued to be reported.
  • In East Asia, an increased level of influenza activity was reported in Southern China, influenza A(H3N2) remained the dominant virus circulating.
  • In Western Asia influenza detections remained low.
  • In the Caribbean countries, influenza and other respiratory virus activity remained low. In Central America, there was a slight increase in influenza virus activity but RSV continued to circulate in several countries as the predominant respiratory virus.
  • In tropical South America, respiratory virus activities remained low with exception of Colombia where RSV activity continued to be reported.
  • In tropical countries of South Asia, influenza virus detections remained low.
  • In South East Asia, influenza activity continued to be reported at low levels in Cambodia, Lao People’s Democratic Republic (PDR), Thailand and Vietnam with influenza A(H3N2) virus predominating. In African region, influenza detections increased in Ghana with B viruses dominating.
  • In temperate South America, influenza and RSV activity continue to decrease throughout the sub-region.
  • In Oceania, influenza virus activity was at inter-seasonal levels.
  • National Influenza Centres (NICs) and other national influenza laboratories from 78 countries, areas or territories reported data to FluNet for the time period from 31 October 2016 to 13 November 2016 (data as of 2016-11-25 04:15:03 UTC).The WHO GISRS laboratories tested more than 75463 specimens during that time period. 3603 were positive for influenza viruses, of which 3248 (90.1%) were typed as influenza A and 355 (9.9%) as influenza B. Of the sub-typed influenza A viruses, 63 (2.5%) were influenza A(H1N1)pdm09 and 2482 (97.5%) were influenza A(H3N2). Of the characterized B viruses, 34 (37%) belonged to the B-Yamagata lineage and 58 (63%) to the B-Victoria lineage.

Detailed influenza update

Seasonal update




Source of data