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Influenza update - 03 June 2011 (World Health Organization, June 7 2011, edited)
[Source: World Health Organization, full page: (LINK). Edited.]
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Influenza update - 03 June 2011
Update number 135
Summary
? The influenza season has finished in the temperate countries of the northern hemisphere with only sporadic influenza virus detections occurring.
? Transmission in tropical countries of the Americas and sub-Saharan Africa has continued to decline.
? South Africa has reported an increase in influenza virus detections, primarily influenza A(H1N1)2009, consistent with the start of their winter influenza season. Seasonal transmission does not appear to have started in other temperate countries of the southern hemisphere.
? A summary review of the northern hemisphere winter influenza season is now available as a WER or as an expanded online version.
Countries in the temperate zone of the northern hemisphere
Nothern hemisphere circulation of influenza viruses (snapshot) pdf, 107kb
Influenza transmission in all reporting countries in the temperate regions of the northern hemisphere has now subsided to very low, intra-seasonal levels.
Sporadic detections of influenza viruses have been reported in many countries across the northern temperate zone but no active community transmission has been noted.
Countries in the tropical zone
Very little influenza activity has been reported since the last update in tropical areas, though some localized transmission has been noted.
Transmission has continued to occur in the Dominican Republic, all influenza A(H1N1)2009, and Jamaica, primarily influenza type B with smaller numbers of H1N1 (2009), but the numbers of cases are low and decreasing in both countries.
An unconfirmed media account has reported that new cases of H1N1 (2009) were detected in Bolivia in late May along with an increase in severe respiratory infections.
Many countries of the northern, tropical areas of South America report large numbers of respiratory disease in children, including hospital admissions for pneumonia, related to respiratory syncytial virus.
Transmission in the tropical areas of sub-Saharan Africa has largely subsided to very low levels, including previously noted active transmission in Kenya and Ghana.
Madagascar has continued to report small numbers of influenza type B, influenza A(H3N2), and influenza A(H1N1) 2009.
Only sporadic detections of influenza viruses have been reported in the tropical countries of Asia.
Countries in the temperate zone of the southern hemisphere
South America
The National Institute for Communicable Diseases in South Africa has reported an increase in influenza viruses over the last four to five weeks consistent with the start of the influenza season. The large majority of viruses isolated have been influenza A(H1N1)2009 with a very small number of influenza A(H3N2).
Southern Africa
South Africa circulation of influenza viruses (snapshot) pdf, 102kb
The National Institute for Communicable Diseases in South Africa has reported an increase in influenza viruses over the last four to five weeks consistent with the start of the influenza season. The large majority of viruses isolated have been influenza A(H1N1)2009 with a very small number of influenza A(H3N2).
Australia and New Zealand and South Pacific
Oceania Melanesia and Polynesia (snapshot) pdf, 113kb
The influenza season does not appear to have started yet in either Australia or New Zealand.
Although Australia had previously noted unusual out-of-season influenza virus transmission, rates of detection have recently decreased and levels of influenza-like illness (ILI) have remained low in the majority of surveillance systems reporting.
New Zealand has reported sporadic detections of influenza viruses, primarily H1N1 (2009) and influenza B, however weekly consultation rates for ILI have remained below baseline nationally.
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 Network) 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.
-Update number 135
Summary
? The influenza season has finished in the temperate countries of the northern hemisphere with only sporadic influenza virus detections occurring.
? Transmission in tropical countries of the Americas and sub-Saharan Africa has continued to decline.
? South Africa has reported an increase in influenza virus detections, primarily influenza A(H1N1)2009, consistent with the start of their winter influenza season. Seasonal transmission does not appear to have started in other temperate countries of the southern hemisphere.
? A summary review of the northern hemisphere winter influenza season is now available as a WER or as an expanded online version.
Countries in the temperate zone of the northern hemisphere
Nothern hemisphere circulation of influenza viruses (snapshot) pdf, 107kb
Influenza transmission in all reporting countries in the temperate regions of the northern hemisphere has now subsided to very low, intra-seasonal levels.
Sporadic detections of influenza viruses have been reported in many countries across the northern temperate zone but no active community transmission has been noted.
Countries in the tropical zone
Very little influenza activity has been reported since the last update in tropical areas, though some localized transmission has been noted.
Transmission has continued to occur in the Dominican Republic, all influenza A(H1N1)2009, and Jamaica, primarily influenza type B with smaller numbers of H1N1 (2009), but the numbers of cases are low and decreasing in both countries.
An unconfirmed media account has reported that new cases of H1N1 (2009) were detected in Bolivia in late May along with an increase in severe respiratory infections.
Many countries of the northern, tropical areas of South America report large numbers of respiratory disease in children, including hospital admissions for pneumonia, related to respiratory syncytial virus.
Transmission in the tropical areas of sub-Saharan Africa has largely subsided to very low levels, including previously noted active transmission in Kenya and Ghana.
Madagascar has continued to report small numbers of influenza type B, influenza A(H3N2), and influenza A(H1N1) 2009.
Only sporadic detections of influenza viruses have been reported in the tropical countries of Asia.
Countries in the temperate zone of the southern hemisphere
South America
The National Institute for Communicable Diseases in South Africa has reported an increase in influenza viruses over the last four to five weeks consistent with the start of the influenza season. The large majority of viruses isolated have been influenza A(H1N1)2009 with a very small number of influenza A(H3N2).
Southern Africa
South Africa circulation of influenza viruses (snapshot) pdf, 102kb
The National Institute for Communicable Diseases in South Africa has reported an increase in influenza viruses over the last four to five weeks consistent with the start of the influenza season. The large majority of viruses isolated have been influenza A(H1N1)2009 with a very small number of influenza A(H3N2).
Australia and New Zealand and South Pacific
Oceania Melanesia and Polynesia (snapshot) pdf, 113kb
The influenza season does not appear to have started yet in either Australia or New Zealand.
Although Australia had previously noted unusual out-of-season influenza virus transmission, rates of detection have recently decreased and levels of influenza-like illness (ILI) have remained low in the majority of surveillance systems reporting.
New Zealand has reported sporadic detections of influenza viruses, primarily H1N1 (2009) and influenza B, however weekly consultation rates for ILI have remained below baseline nationally.
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 Network) 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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