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Influenza update

17 August 2012 - Update number 166

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Summary

• Most countries in the northern temperate zone have stopped weekly reporting or moved over to out of season surveillance schedules. The United States of America is continuing to detect cases of influenza A(H3N2)v in humans. Most case have occurred with contact to swine and no sustained human to human transmission has been identified.
• In the tropical zone, the countries reporting notable influenza activity are Brazil, Cuba, El Salvador, Honduras and Panama in the Americas (influenza A(H1N1)pdm09 and type B); Ghana and Madagascar in sub-Saharan Africa (influenza A(H3N2) and type B); Bangladesh, southern China, India, Singapore, Sri Lanka and Viet Nam in Asia (influenza A(H3N2) or B).
• While New Zealand continues to report increases in some indicators, influenza activities have decreased in most of the temperate countries of the southern hemisphere. Australia, Chile, Paraguay and South Africa, continue to report declines in indicators. Argentina continues to report very low numbers of detections throughout 2012.
• Influenza A(H3N2) viruses are the most commonly reported type/sub-type in recent weeks across the southern hemisphere temperate region in Chile, South Africa, and Australia. A(H1N1)pdm09 is the most common influenza virus detected in Paraguay as well as neighbouring areas of southern Brazil and the Plurinational State of Bolivia, whereas Ecuador, El Salvador, Panama and Peru are reporting mostly influenza B.

• -Full version Epidemiological influenza surveillance update
  pdf, 1.43Mb

• - Virological influenza surveillance update

• - Peer-reviewed literature
  Early estimates of seasonal influenza vaccine effectiveness in Europe among target groups for vaccination: results from the I-MOVE multicentre case–control study, 2011/12

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.

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