Influenza

FluNet Summary

18 May 2015

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

Based on FluNet reporting (as of 12 May 2015 14:05 UTC), National Influenza Centres (NICs) and other national influenza laboratories from 86 countries, areas or territories reported data for the time period from 19 April 2015 to 2 May 2015 a. The WHO GISRS laboratories tested more than 51 009 specimens. 4728 were positive for influenza viruses, of which 1234 (26.1%) were typed as influenza A and 3494 (73.9%) as influenza B. Of the sub-typed influenza A viruses, 456 (53.8%) were influenza A(H1N1)pdm09 and 391 (46.2%) were influenza A(H3N2). Of the characterized B viruses, 285 (94.7%) belonged to the B-Yamagata lineage and 16 (5.3%) to the B-Victoria lineage.

Global circulation of influenza viruses
(GISRS-FluNet, snapshot 12 May 2015)

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aThe time period from 19 April 2015 to 2 May 2015 corresponds to

  • FluNet / American calendar: weeks 16 and 17
  • International standard ISO 8601: weeks 17 and 18

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