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Influenza update

22 June 2012 - Update number 162

• Open map in new window
  jpg, 470kb

Summary

•The influenza season is largely finished in the temperate countries of the northern hemisphere with some persistent low level influenza transmission in eastern Europe and northern China. Most northern hemisphere temperate countries have now stopped weekly influenza data reporting.
•Some tropical countries are experiencing an increase or stable transmission of influenza viruses including countries in Central America, the Caribbean, South America and, in Sub-Saharan Africa.
•The influenza season has not yet started in the temperate countries of the southern hemisphere, although several countries including Australia, Chile, Paraguay and South Africa have reported small but sustained increase of influenza virus detections. Influenza A(H3N2) viruses are the most commonly detected type/sub-type in recent weeks in the Southern Hemisphere temperate region.

• -Full version Epidemiological influenza surveillance update
  pdf, 897kb

• - Virological influenza surveillance update

• Review of the 2011/2012 northern hemisphere influenza season
  pdf, 1.76Mb

• Peer-reviewed literature
  A Population-Based Study of Neurologic Manifestations of Severe Influenza A(H1N1)pdm09 in California

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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