Pandemic (H1N1) 2009 - update 65
Weekly update (Virological surveillance data)
11 September 2009 -
The Global Influenza Surveillance Network (GISN) continues monitoring the global circulation of influenza viruses, including seasonal viruses.
Since the beginning of the pandemic in 19 April 2009 to August 29th, a total of 80 countries reported to FluNet. The total number of specimens reported positive for influenza viruses by NIC laboratories was 93,628. Of these, 56,812 (60.7%) were pandemic H1N1, 5429 (5.8%) were seasonal A (H1), 12,476 (13.3%) were A (H3), 15,326 (16.4%) were A (not subtyped) and 3585 (3.8%) were influenza B.
For this reporting week (23 August to 29 August 2009); a total of 26 countries reported to FluNet. The total number of specimens reported positive for influenza viruses by NIC laboratories was 5640. Of these, 4294 (76.1%) were pandemic H1N1, 139 (2.5%) were seasonal A (H1), 696 (12.3%) were A (H3), 476 (8.4%) were A (not subtyped) and 35 (0.4%) were influenza B. On average, the pandemic (H1N1) accounted for 76% of all influenza detections. Pandemic (H1N1) influenza virus continues to be the predominant circulating virus of influenza, both in the northern and southern hemisphere.
All pandemic H1N1 2009 influenza viruses analysed to date have been antigenically and genetically similar to A/California/7/2009-like pandemic H1N1 2009 virus.