Influenza

FluNet Summary

24 March 2014

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

Based on FluNet reporting (as of 20 March 2014, 13:20 UTC), during weeks 9 to 10 (23 February 2014 to 8 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 74 758 specimens. 13 548 were positive for influenza viruses, of which 10 289 (75.9%) were typed as influenza A and 3259 (24.1%) as influenza B. Of the sub-typed influenza A viruses, 4470 (65%) were influenza A(H1N1)pdm09 and 2410 (35%) were influenza A(H3N2). Of the characterized B viruses, 222 (87.4%) belong to the B-Yamagata lineage and 32 (12.6%) to the B-Victoria lineage.

Global circulation of influenza viruses
(GISRS-FluNet, snapshot 20 March 2014)

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