Influenza

FluNet Summary

23 February 2015

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

Based on FluNet reporting (as of 20 February 2015, 08:25 UTC), during weeks 4 to 5 (25 January 2015 to 7 February 2015), National Influenza Centres (NICs) and other national influenza laboratories from 90 countries, areas or territories reported data. The WHO GISRS laboratories tested more than 138 720 specimens. 32 769 were positive for influenza viruses, of which 26 664 (81.4%) were typed as influenza A and 6105 (18.6%) as influenza B. Of the sub-typed seasonal influenza A viruses, 1580 (12.5%) were influenza A(H1N1)pdm09 and 11 094 (87.5%) were influenza A(H3N2). Of the characterized B viruses, 1813 (97.3%) belonged to the B-Yamagata lineage and 50 (2.7%) to the B-Victoria lineage.

Global circulation of influenza viruses
(GISRS-FluNet, snapshot 20 February 2015)

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