Influenza

FluNet Summary

15 May 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 17 April 2017 to 30 April 2017 a (data as of 2017-05-12 06:57:21 UTC). The WHO GISRS laboratories tested more than 79447 specimens during that time period. 7736 were positive for influenza viruses, of which 2683 (34.7%) were typed as influenza A and 5053 (65.3%) as influenza B. Of the sub-typed influenza A viruses, 642 (45.1%) were influenza A(H1N1)pdm09 and 782 (54.9%) were influenza A(H3N2). Of the characterized B viruses, 396 (51.8%) belonged to the B-Yamagata lineage and 369 (48.2%) to the B-Victoria lineage.

Global circulation of influenza viruses
(GISRS-FluNet, snapshot 12 May 2017)

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aThe time period from 17 April 2017 to 30 April 2017 corresponds to

  • FluNet / American calendar / International standard ISO 8601: weeks 16 and 17

Other analyses