Influenza update
07 December 2012 - Update number 174
Summary
• Many countries of the northern hemisphere temperate region, especially in North America, reported increasing influenza virus detections. Canada and the United States of America (USA) crossed their seasonal threshold but activity was highest in the southern part of the USA. Influenza activity remained low in Europe but has continued to increase slightly.
• Low levels of influenza activity was reported in countries in southern and southeast Asia, except Cambodia.
• In Sub-Saharan Africa, influenza activity remains at low levels.
• Influenza activity in the temperate countries of the southern hemisphere continued at inter-seasonal levels.
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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