Influenza

FluNet Summary

16 April 2018

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

National Influenza Centres (NICs) and other national influenza laboratories from 107 countries, areas or territories reported data to FluNet for the time period from 19 March 2018 to 01 April 2018a (data as of 2018-04-13 03:50:07 UTC). The WHO GISRS laboratories tested more than 171054 specimens during that time period. 34751 were positive for influenza viruses, of which 18186 (52.3%) were typed as influenza A and 16565 (47.7%) as influenza B. Of the sub-typed influenza A viruses, 4763 (62.7%) were influenza A(H1N1)pdm09 and 2839 (37.3%) were influenza A(H3N2). Of the characterized B viruses, 1704 (91%) belonged to the B-Yamagata lineage and 169 (9%) to the B-Victoria lineage.

Global circulation of influenza viruses
(GISRS-FluNet, snapshot 13 April 2018)

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aThe time period from 19 March 2018 to 01 April 2018 corresponds to

  • FluNet / American calendar / International standard ISO 8601: weeks 12 and 13

Other analyses