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11 Jul 2013

Influenza virus activity in the world, 9 July 2013 (WHO, edited)

[Source: World Health Organization, full page: (LINK). Edited.]

Influenza virus activity in the world, 9 July 2013

Source: Laboratory confirmed data from the Global Influenza Surveillance and Response System (GISRS).

Based on FluNet reporting (as of 2 July 2014, 09:40 UTC), during weeks 24 to 25 (9 June 2013 to 22 June 2013), National Influenza Centres (NICs) and other national influenza laboratories from 72 countries, areas or territories reported data.

The WHO GISRS laboratories tested more than 26 229 specimens. 2030 were positive for influenza viruses, of which 1605 (79.1%) were typed as influenza A and 425 (20.9%) as influenza B.

Of the sub-typed influenza A viruses, 956 (71.9%) were influenza A(H1N1)pdm09 and 374 (28.1%) were influenza A(H3N2). Of the characterized B viruses, 8 (57.1%) belong to the B-Yamagata lineage and 6 (42.9%) to the B-Victoria lineage.



During weeks 24 and 25, A(H1N1)pdm09 viruses continued to be the predominant virus detected globally followed by A(H3N2) and influenza B viruses. A slight increase in influenza activity was reported from parts of the southern hemisphere while influenza activity remained low in the northern hemisphere.

Influenza activity remained low in Asia and Oceania with reports of sporadic detections of A(H3N2) viruses.

In Central and South America, A(H1N1)pdm09 viruses were the predominantly circulating virus subtype detected, and co-circulated with A(H3N2) viruses. Increased detections of influenza B viruses were reported by Brazil and the Plurinational State of Bolivia while increased A(H3N2) detections were reported by Paraguay.

Influenza activity in Africa was generally low with the exception of South Africa where A(H1N1)pdm09 continued to circulate and increased influenza B activity was reported by Côte d’Ivoire.

In the northern hemisphere, influenza activity remained low in North America and Europe.

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