30 August 2013 - Update number 193
• Influenza activity in the northern hemisphere temperate zones remained at inter-seasonal levels.
• In most parts of tropical Asia influenza activity decreased.
• In Central America and the Caribbean, influenza and Respiratory Syncytial Virus (RSV) transmission declined. RSV, influenza A(H1N1)pdm09 and influenza A(H3N2) were the main respiratory viruses reported.
• In tropical South America, influenza A(H1N1)pmd09 virus predominated. A significant increase in influenza A(H1N1)pdm09 activity was observed in Peru in the middle of July, while influenza activity in general decreased in Venezuela, Ecuador and Brazil.
• Influenza activity peaked in the temperate areas of South America and in South Africa in late June. Influenza activity in these areas was primarily associated with influenza A(H1N1)pdm09 virus throughout the season, with increasing influenza A(H3N2) virus detections observed towards the end.
• In Australia and New Zealand, numbers of influenza viruses detected and rates of influenza-like illness were lower than in previous years, but showed an increasing trend. Influenza A(H3N2) and type B were much more commonly detected than A(H1N1)pdm09 in both countries.
• As of 11 August, a total of 135 cases of influenza A(H7N9) virus infection were reported. For more details see link below
Source of data
The Global Influenza Programme monitors influenza activity worldwide and publishes an update every two weeks.
The updates are based on available epidemiological and virological data sources, including FluNet (reported by the Global Influenza Surveillance and Response System) and influenza reports from WHO Regional Offices and Member States. Completeness can vary among updates due to availability and quality of data available at the time when the update is developed.