Title: #Influenza – #Global #Update No. 288 based on data up to 16 April, 2017.
Subject: Human Influenza Viruses, seasonal epidemics, global situation update.
Source: World Health Organization (WHO), full page: (LINK). Summary.
Code: [ ]
Influenza – Update No. 288 based on data up to 16 April, 2017
- Influenza activity in the temperate zone of the northern hemisphere continued to decrease.
- Influenza activity remained low in the temperate zone of the southern hemisphere.
- Worldwide, influenza A(H3N2) and B viruses were predominant, with an increased proportion of influenza B viruses detected in recent weeks.
- In North America, overall influenza activity continued to decrease.
- In Canada, influenza A(H3N2) viruses continued to be the most common subtype of influenza detected, followed by influenza B virus.
- In Mexico, all seasonal influenza types/subtypes were detected.
- In the United States of America influenza B virus was predominant.
- In Europe, influenza activity continued to decrease to low levels, with detections of predominantly influenza B viruses in Northern and Eastern Europe.
- Influenza-like illness (ILI) and severe acute respiratory infection (SARI) indicators were generally low or below baseline in most countries.
- In Northern Africa, influenza activity remained low. Sporadic detections of influenza A(H3N2) viruses were reported in Tunisia.
- In Western Asia, influenza activity continued to decrease with influenza B viruses predominant in the region.
- SARI levels continued to decrease in Georgia, while remained stable in Armenia.
- In Oman, low influenza activity was reported with influenza A(H1N1)pdm09 virus predominant.
- In Central Asia, ILI and SARI activities continued to decrease; influenza virus detections were also low.
- In East Asia, influenza activity continued to be reported with all seasonal influenza types/subtypes detected in the region.
- In both Northern and Southern China, influenza A(H1N1)pdm09 virus detections increased in recent weeks.
- Influenza B virus detections continued to be reported in Southern China and the Republic of Korea; influenza B Victoria lineage was predominant in Southern China.
- In the Caribbean and Central America countries, respiratory virus activity remained low.
- In tropical South America, influenza activity increased slightly with influenza A(H3N2) viruses predominating.
- Other respiratory virus activities remained low in general, except in Colombia where elevated activity of respiratory syncytial virus (RSV) continued to be reported.
- In Western Africa, low levels of influenza activity continued to be reported in Côte d’Ivoire, Ghana, Senegal and Sierra Leone, with all seasonal influenza types/subtypes co-circulating in the region.
- In Eastern Africa, increased detections of influenza A(H3N2)and B viruses were reported in Madagascar and Tanzania in the recent weeks.
- In Southern Asia, influenza activity continued to be reported although it appeared to be decreasing.
- In India and the Maldives, influenza A(H1N1)pdm09 continued to be reported.
- In Pakistan, sporadic cases of influenza A(H3N2) viruses were reported in the recent weeks.
- In Bhutan, ILI levels and influenza activity appeared to decrease, with influenza A(H3N2) and B viruses circulating.
- In South East Asia, influenza activity remained low, with all seasonal influenza types/subtypes detected in the region.
- In the temperate zone of the Southern Hemisphere, influenza activity was at inter-seasonal levels.
- In Chile, ILI activity increased but has not reached the seasonal threshold in recent weeks, consistent with past seasonal trends.
National Influenza Centres (NICs) and other national influenza laboratories from 95 countries, areas or territories reported data to FluNet for the time period from 03 April 2017 to 16 April 2017 (data as of 2017-04-27 11:16:47 UTC).
The WHO GISRS laboratories tested more than 109373 specimens during that time period.
14597 were positive for influenza viruses, of which 6108 (41.8%) were typed as influenza A and 8489 (58.2%) as influenza B.
Of the sub-typed influenza A viruses, 1358 (42.5%) were influenza A(H1N1)pdm09 and 1834 (57.5%) were influenza A(H3N2).
Of the characterized B viruses, 747 (49.3%) belonged to the B-Yamagata lineage and 767 (50.7%) to the B-Victoria lineage.
Detailed influenza update: |—Download PDF pdf, 557kb –|
Seasonal update: |-- Seasonal influenza reviews –|
|-- Disease outbreak news –|
Keywords: WHO; Updates; Worldwide; Seasonal Influenza.