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Influenza update

16 March 2012- Update number 155

Table of content

- Summary

• -Full version Epidemiological influenza surveillance update
  pdf, 753kb

• -Virological influenza surveillance update

• -Peer reviewed literature: Tong S. et al: A distinct lineage of influenza A virus from bats

• Open map in new window
  jpg, 711kb

Summary

•Active influenza transmission continued in the temperate regions of the Northern Hemisphere with increasing activity in North America, northern China and several countries in Europe. A few countries in southern Europe and North Africa have peaked as well as Japan and the Republic of Korea.
•Most countries of the tropical zone reported low levels of influenza activity.
•The most commonly detected virus type or subtype throughout most of the temperate areas of northern hemisphere temperate zone has been influenza A(H3N2). In Mexico and Central America where influenza A(H1N1)pdm09 is the predominant subtype circulating; China and the surrounding countries which are still reporting a predominance of influenza type B virus.
• Antiviral resistance continues to be observed at very low levels and has not increased notably over levels reported in previous seasons.

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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