06 July 2012 - Update number 163
•The influenza season is largely finished in the temperate countries of the northern hemisphere and most countries in the northern temperate zone have now stopped weekly reporting. A detailed review of the recent influenza season in the temperate countries of the northern hemisphere is available online here
•In the tropical zone, Brazil, Paraguay and Honduras have reported notable influenza activity in the Americas; Ghana in sub-Saharan Africa; and southern China, including Hong Kong Special Administrative Region, and Vietnam in Asia.
•The influenza season has commenced in most temperate countries of the southern hemisphere for which there is data. In Argentina, however, influenza remains nearly undetectable and although New Zealand has reported persistent increases in influenza virus detections over the last three reporting weeks, influenza-like illness (ILI) reports remained below the national baseline.
•Influenza A(H3N2) viruses were the most commonly reported type/sub-type in recent weeks in the Southern Hemisphere temperate region in Chile, South Africa, and Australia; however, significant numbers of influenza type B were also reported in South Africa and to a lesser extent, Australia. Very few influenza A(H1N1)pdm09 viruses have been reported in the temperate region however A(H1N1)09 is currently the most commonly detected virus in active countries of Central and tropical South America.
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.