Influenza

FluNet Summary

7 April 2014

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

Based on FluNet reporting (as of 3 April 2014, 12:35 UTC), during weeks 11 to 12 (9 March 2014 to 22 March 2014), National Influenza Centres (NICs) and other national influenza laboratories from 96 countries, areas or territories reported data. The WHO GISRS laboratories tested more than 65 498 specimens. 10 986 were positive for influenza viruses, of which 7407 (67.4%) were typed as influenza A and 3579 (32.6%) as influenza B. Of the sub-typed influenza A viruses, 2747 (57%) were influenza A(H1N1)pdm09 and 2072 (43%) were influenza A(H3N2). Of the characterized B viruses, 222 (87.1%) belong to the B-Yamagata lineage and 33 (12.9%) to the B-Victoria lineage.

Global circulation of influenza viruses
(GISRS-FluNet, snapshot 3 April 2014)

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