Influenza

FluNet Summary

17 April 2017

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

National Influenza Centres (NICs) and other national influenza laboratories from 103 countries, areas or territories reported data to FluNet for the time period from 20 March 2017 to 02 April 2017 a (data as of 2017-04-14 05:41:03 UTC). The WHO GISRS laboratories tested more than 118962 specimens during that time period. 19667 were positive for influenza viruses, of which 9791 (49.8%) were typed as influenza A and 9876 (50.2%) as influenza B. Of the sub-typed influenza A viruses, 924 (26.2%) were influenza A(H1N1)pdm09 and 2609 (73.8%) were influenza A(H3N2). Of the characterized B viruses, 784 (65%) belonged to the B-Yamagata lineage and 423 (35%) to the B-Victoria lineage.

Global circulation of influenza viruses
(GISRS-FluNet, snapshot 14 April 2017)

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aThe time period from 20 March 2017 to 02 April 2017 corresponds to

  • FluNet / American calendar / International standard ISO 8601: weeks 12 and 13

Other analyses