Influenza

FluNet Summary

4 May 2015

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

Based on FluNet reporting (as of 30 April 2015, 12:00 UTC), ), National Influenza Centres (NICs) and other national influenza laboratories from 89 countries, areas or territories reported data for the time period from 5 April 2015 to 18 April 2015a. The WHO GISRS laboratories tested more than 65 361 specimens. 8249 were positive for influenza viruses, of which 2566 (31.1%) were typed as influenza A and 5683 (68.9%) as influenza B. Of the sub-typed influenza A viruses, 670 (37.6%) were influenza A(H1N1)pdm09 and 1114 (62.4%) were influenza A(H3N2). Of the characterized B viruses, 1127 (95.0%) belonged to the B-Yamagata lineage and 59 (5.0%) to the B-Victoria lineage.

Global circulation of influenza viruses
(GISRS-FluNet, snapshot 30 April 2015)

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aThe time period from 5 April 2015 to 18 April 2015 corresponds to

  • FluNet / American calendar: weeks 14 and 15
  • International standard ISO 8601: weeks 15 and 16

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