Influenza Update

Contributed by Dr Ashwini Tayade

National Influenza Centres (NICs) and other national influenza laboratories from 104 countries, areas or territories reported data to FluNet for the time period from 24 December 2018 to 06 January 2019 a(data as of 2019-01-18 04:01:21 UTC). The WHO GISRS laboratories tested more than 191778 specimens during that time period. 39161 were positive for influenza viruses, of which 38493 (98.3%) were typed as influenza A and 668 (1.7%) as influenza B. Of the sub-typed influenza A viruses, 13313 (79.4%) were influenza A(H1N1)pdm09 and 3446 (20.6%) were influenza A(H3N2). Of the characterized B viruses, 45 (38.1%) belonged to the B-Yamagata lineage and 73 (61.9%) to the BVictoria lineage.