Title: #Influenza #update No. 279, based on data up to 11 December, 2016.
Subject: Seasonal Human Influenza Viruses, global activity surveillance report.
Source: World Health Organization (WHO), full page: (LINK).
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Influenza update No. 279, based on data up to 11 December, 2016
- Influenza activity in the temperate zone of the northern hemisphere increased slightly, with some countries passing their seasonal threshold, which is early for the season. Worldwide, influenza A(H3N2) virus was predominant.
- In North America, influenza activity continued to increase with influenza A(H3N2) virus predominating.
- Influenza-like illness (ILI) levels remained below seasonal thresholds.
- In the United States, respiratory syncytial virus (RSV) activity continued to be reported.
- In Europe, influenza activity was low but has started to rise, with a positivity rate of 28% among sentinel surveillance samples.
- The highest numbers of influenza cases were detected in Norway and Sweden.
- In South West Europe, influenza activity was higher in Portugal and Spain.
- In East Asia, influenza activity continued to increase with influenza A(H3N2) remaining the dominant virus circulating.
- In Western Asia, influenza detections slightly increased.
- In Northern Africa, influenza detections were reported in Morocco with influenza A(H3N2) virus dominating.
- In the Caribbean countries, influenza and other respiratory virus activity remained low.
- In Central America, there was a slight decrease in influenza and other respiratory viruses activity in most of the countries.
- In Costa Rica, influenza activity increased with influenza A(H1N1)pdm09 and A(H3N2) viruses co-circulating and RSV activity continued to be reported.
- In tropical South America, influenza and other respiratory viruses activity remained low with exception of Colombia where both influenza and RSV activity continued to be reported.
- In Southern Asia, influenza detections slightly increased in both Iran and Sri Lanka with influenza A(H3N2) as the most frequently detected virus in this region.
- In South East Asia, influenza activity continued to be reported at low levels, with influenza A(H3N2) virus predominant in the region.
- In West Africa, influenza detections increased in Ghana with B viruses dominating.
- In Southern Africa, influenza activity continued at inter-seasonal levels.
- In temperate South America, influenza and RSV activity continued to decrease throughout the sub-region.
- In Oceania, influenza virus activity was reported 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 28 November 2016 to 11 December 2016 (data as of 2016-12-22 14:50:28 UTC).
The WHO GISRS laboratories tested more than 115769 specimens during that time period.
12979 were positive for influenza viruses, of which 12221 (94.2%) were typed as influenza A and 758 (5.8%) as influenza B.
Of the sub-typed influenza A viruses, 118 (1.5%) were influenza A(H1N1)pdm09 and 7709 (98.5%) were influenza A(H3N2).
Of the characterized B viruses, 74 (48.1%) belonged to the B-Yamagata lineage and 80 (51.9%) to the B-Victoria lineage.
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Keywords: WHO; Worldwide; Seasonal Influenza, Updates.