Influenza

FluNet Summary

22 April 2014

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

Based on FluNet reporting (as of 15 April 2014, 10:15 UTC), during weeks 13 to 14 (23 March 2014 to 5 April 2014), National Influenza Centres (NICs) and other national influenza laboratories from 82 countries, areas or territories reported data. The WHO GISRS laboratories tested more than 44 319 specimens. 6717 were positive for influenza viruses, of which 4163 (62%) were typed as influenza A and 2554 (38%) as influenza B. Of the sub-typed influenza A viruses, 1149 (47.2%) were influenza A(H1N1)pdm09 and 1287 (52.8%) were influenza A(H3N2). Of the characterized B viruses, 224 (83%) belong to the B-Yamagata lineage and 46 (17%) to the B-Victoria lineage.

Global circulation of influenza viruses
(GISRS-FluNet, snapshot 15 April 2014)

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