12/23/2013

Influenza virus activity in the world, 20 December 2013 (WHO, edited)

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

Influenza virus activity in the world, 20 December 2013

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

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Based on FluNet reporting (as of 19 December 2013, 07:15 UTC), during weeks 46 to 47 (10 November 2013 to 23 November 2013), during weeks 48 to 49 (24 November 2013 to 7 December 2013), National Influenza Centres (NICs) and other national influenza laboratories from 89 countries, areas or territories reported data.

The WHO GISRS laboratories tested more than 42 360 specimens.

3304 were positive for influenza viruses, of which 2817 (85.3%) were typed as influenza A and 487 (14.7%) as influenza B.

Of the sub-typed influenza A viruses, 1166 (66.3%) were influenza A(H1N1)pdm09, 591 (33.6%) were influenza A(H3N2) and 1 (0.1%) was influenza A(H7N9).

Of the characterized B viruses, 39 (70.9%) belong to the B-Yamagata lineage and 16 (29.1%) to the B-Victoria lineage.

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