Influenza update - 312

02 April 2018 - Update number 312, based on data up to 18 March 2018

Information in this report is categorized by influenza transmission zones, which are geographical groups of countries, areas or territories with similar influenza transmission patterns. For more information on influenza transmission zones, see this link.

Summary

Influenza activity appeared to decrease in most of the countries in the temperate zone of the northern hemisphere, with exception of Eastern Europe where activity continued to increase. In the temperate zone of the southern hemisphere, inluenza activity remained at inter-seasonal levels. Worldwide, influenza A and influenza B accounted for a similar proportion of influenza detections. 

National Influenza Centres (NICs) and other national influenza laboratories from 107 countries, areas or territories reported data to FluNet for the time period from 05 March 2018 to 18 March 2018 (data as of 2018-03- 30 04:46:41 UTC).The WHO GISRS laboratories tested more than 206175 specimens during that time period. 50579 were positive for influenza viruses, of which 23651 (46.8%) were typed as influenza A and 26928 (53.2%) as influenza B. Of the sub-typed influenza A viruses, 6313 (64%) were influenza A(H1N1)pdm09 and 3552 (36%) were influenza A(H3N2). Of the characterized B viruses, 3184 (91%) belonged to the B-Yamagata lineage and 316 (9%) to the B-Victoria lineage.

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