Pandemic (H1N1) 2009 - update 60
Laboratory-confirmed cases of pandemic (H1N1) 2009 as officially reported to WHO by States Parties to the IHR (2005) as 31 July 2009
31 July 2009
As of 31 of July 2009, 168 countries and overseas territories/communities have reported at least one laboratory confirmed case of pandemic (H1N1) 09. All continents are affected by the pandemic.
The countries and overseas territories/communities that have newly reported their first pandemic (H1N1) 2009 confirmed case(s) since the last web update (27 July 2009) as of 31 July 2009 are:
Azerbaijan, Gabon, Grenada, Kazakhstan, Moldova, Monaco, Nauru, Swaziland, Suriname
*Given that countries are no longer required to test and report individual cases, the number of cases reported actually understates the real number of cases.
Qualitative indicators (as of Week 29: 13 July - 19 July 2009)
Human infection with pandemic (H1N1) 2009 virus: updated interim WHO guidance on global surveillance
1. Geographic spread of influenza activity
2. Trend of respiratory diseases activity compared to the previous week
3. Intensity of acute respiratory diseases in the population
4. Impact on health care services
Update on the virus situation (as of Week 30: 20 July - 26 July 2009)
Pandemic (H1N1) 2009 virus
According to FluNet reporting from the Global Influenza Surveillance Network (GISN), 3548 detections of the pandemic (H1N1) 2009 influenza virus were reported from 13 countries in week 30. The majority of detections were reported by China, Hong Kong SAR (25%, 1788 detections), followed by Australia (21%, 834 detections) and Italy (16%, 600 detections). Among the 13 countries, on average, the pandemic (H1N1) 2009 influenza virus accounted for 71% of all influenza virus detections (66% in northern hemisphere and 89% in southern hemisphere). The highest rate of detection of pandemic (H1N1) 2009 influenza virus was reported by Greece (99%; 147 out of 149 detections), Chile (98%; 160 out of 163), the Republic of Korea (98%; 258 out of 263), Italy (97%; 584 out of 600), and Australia (89%; 745 out of 834).
All pandemic (H1N1) 2009 influenza viruses analyzed to date are antigenically and genetically similar.
Antiviral resistance pandemic (H1N1) virus
A total of six oseltamivir resistant pandemic (H1N1) 2009 influenza viruses have now been detected from Denmark, Hong Kong SAR, Japan and Canada. Of these three were from patients in Japan. All six patients had received oseltamivir with the exception of one and have recovered well. All resistant viruses had the characteristic mutation at position 274/275 associated with resistance.