Influenza

FluNet Summary

23 March 2015

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

Based on FluNet reporting (as of 19 March 2015, 13:25 UTC), National Influenza Centres (NICs) and other national influenza laboratories from 95 countries, areas or territories reported data for the time period from 22 February 2015 to 7 March 2015a. The WHO GISRS laboratories tested more than 111 964 specimens. 27 176 were positive for influenza viruses, of which 17 711 (65.2%) were typed as influenza A and 9464 (34.8%) as influenza B. Of the sub-typed influenza A viruses, 3383 (33.9%) were influenza A(H1N1)pdm09 and 6594 (66.1%) were influenza A(H3N2). Of the characterized B viruses, 1903 (97.1%) belonged to the B-Yamagata lineage and 57 (2.9%) to the B-Victoria lineage.

Global circulation of influenza viruses
(GISRS-FluNet, snapshot 19 March 2015)

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aThe time period from 22 February 2015 to 7 March 2015 corresponds to

  • FluNet / American calendar: weeks 8 and 9
  • International standard ISO 8601: weeks 9 and 10

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