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Influenza virus activity in the world, 2 September 2013 (WHO, edited): Wks 32-33, H3N2 predominant strain globally
[Source: World Health Organization, full page: (LINK). Edited.]
Influenza virus activity in the world, 2 September 2013
Source: Laboratory confirmed data from the Global Influenza Surveillance and Response System (GISRS).
Based on FluNet reporting (as of 27 August 2013, 09:20 UTC), during weeks 32 to 33 (4 August 2013 to 17 August 2013), National Influenza Centres (NICs) and other national influenza laboratories from 64 countries, areas or territories reported data.
The WHO GISRS laboratories tested more than 12 286 specimens. 1224 were positive for influenza viruses, of which 1009 (82.4%) were typed as influenza A and 215 (17.6%) as influenza B. Of the sub-typed influenza A viruses, 402 (43.8%) were influenza A(H1N1)pdm09 and 516 (56.2%) were influenza A(H3N2). Of the characterized B viruses, 10 (66.7%) belong to the B-Yamagata lineage and 5 (33.3%) to the B-Victoria lineage.
Summary
During weeks 32 and 33, A(H3N2) viruses were the predominant subtype detected globally followed by A(H1N1)pdm09 and influenza B viruses. Overall, influenza activity remained low in the northern and southern hemispheres.
In Oceania, influenza activity remained high with predominance of A(H3N2) viruses in Australia and influenza B co-circulating with A(H3N2) viruses in New Zealand.
Influenza activity decreased in South Africa where A(H3N2) viruses had predominated. Sporadic detections of influenza B were reported from other countries in the African region.
In Asia, A(H3N2) continued to be reported from China and India. Overall influenza activity remained low throughout the region.
In Central and South America, A(H1N1)pdm09 activity remained high in Peru. With lower number of influenza virus detected from many countries, there was a trend observed in decreasing influenza activity in the region.
Influenza activity in North America and Europe remained at out-of-season levels.
Click here for avian influenza A(H7N9) situation updates, risk assessment and other technical information
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Influenza virus activity in the world, 2 September 2013
Source: Laboratory confirmed data from the Global Influenza Surveillance and Response System (GISRS).
Based on FluNet reporting (as of 27 August 2013, 09:20 UTC), during weeks 32 to 33 (4 August 2013 to 17 August 2013), National Influenza Centres (NICs) and other national influenza laboratories from 64 countries, areas or territories reported data.
The WHO GISRS laboratories tested more than 12 286 specimens. 1224 were positive for influenza viruses, of which 1009 (82.4%) were typed as influenza A and 215 (17.6%) as influenza B. Of the sub-typed influenza A viruses, 402 (43.8%) were influenza A(H1N1)pdm09 and 516 (56.2%) were influenza A(H3N2). Of the characterized B viruses, 10 (66.7%) belong to the B-Yamagata lineage and 5 (33.3%) to the B-Victoria lineage.
Summary
During weeks 32 and 33, A(H3N2) viruses were the predominant subtype detected globally followed by A(H1N1)pdm09 and influenza B viruses. Overall, influenza activity remained low in the northern and southern hemispheres.
In Oceania, influenza activity remained high with predominance of A(H3N2) viruses in Australia and influenza B co-circulating with A(H3N2) viruses in New Zealand.
Influenza activity decreased in South Africa where A(H3N2) viruses had predominated. Sporadic detections of influenza B were reported from other countries in the African region.
In Asia, A(H3N2) continued to be reported from China and India. Overall influenza activity remained low throughout the region.
In Central and South America, A(H1N1)pdm09 activity remained high in Peru. With lower number of influenza virus detected from many countries, there was a trend observed in decreasing influenza activity in the region.
Influenza activity in North America and Europe remained at out-of-season levels.
Click here for avian influenza A(H7N9) situation updates, risk assessment and other technical information
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