Influenza

FluNet Summary

6 April 2015

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

Based on FluNet reporting (as of 2 April 2015, 14:15 UTC), ), National Influenza Centres (NICs) and other national influenza laboratories from 88 countries, areas or territories reported data for the time period from 8 March 2015 to 21 March 2015. The WHO GISRS laboratories tested more than 87 715 specimens. 17 828 were positive for influenza viruses, of which 9119 (51.1%) were typed as influenza A and 8707 (48.9%) as influenza B. Of the sub-typed influenza A viruses, 2558 (49.8%) were influenza A(H1N1)pdm09 and 2579 (50.2%) were influenza A(H3N2). Of the characterized B viruses, 427 (97.7%) belonged to the B-Yamagata lineage and 10 (2.3%) to the B-Victoria lineage.

Global circulation of influenza viruses
(GISRS-FluNet, snapshot 2 April 2015)

View full size chart
pdf, 359kb

aThe time period from 8 March 2015 to 21 March 2015 corresponds to

  • FluNet / American calendar: weeks 10 and 11
  • International standard ISO 8601: weeks 11 and 12

Other analyses

Share