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Influenza update

30 March 2012- Update number 156

Table of content

- Summary

• -Full version Epidemiological influenza surveillance update
  pdf, 662kb

• -Virological influenza surveillance update

• -Peer reviewed literature: Everitt et al., IFITM3 restricts the morbidity and mortality associated with influenza

• Open map in new window
  jpg, 711kb

Summary

•This influenza season started late, but seems to be reaching the peak or is decreasing in most countries of the northern hemisphere temperate regions. Severe acute respiratory infections was mainly observed in the age group above 65 years.
•The most commonly detected virus type or subtype throughout most of the temperate areas of northern hemisphere temperate zone has been influenza A(H3N2), although the proportion of influenza B detection is increasing. In Mexico 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
•Increasing genetic and antigenic diversity has been noted in H3N2 viruses in the later part of the influenza season.
• No significant change in antiviral resistance has been reported so far this season.

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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