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Archive - WHO, Pandemic Influenza H1N1 2009 - Weekly virological surveillance (until the end of July 2010)

Weekly virological update: 23 June 2010 - Virological Surveillance, week 23 (6 to 12 June 2010): 298 H1N1pdm resistant to oseltamivir isolated so far

Weekly virological update: 23 June 2010 - Virological Surveillance, week 23 (6 to 12 June 2010): 298 H1N1pdm resistant to oseltamivir isolated so far

[Source: World Health Organization, <cite cite="http://www.who.int/csr/disease/swineflu/laboratory25_06_2010/en/index.html">WHO | Weekly virological update: 23 June 2010</cite>. Edited.]

Weekly virological update: 23 June 2010 - Virological Surveillance, week 23 (6 to 12 June 2010)

Trend of proportions of different type and subtype influenza viruses


Summary on week 23

  • Overall influenza activity has remained at low levels in most parts of the world.
  • In Northern Hemisphere the number of influenza type B virus detections exceeded that of influenza A.
  • However, the detection of influenza A increased in South Hemisphere with the proportion of A(H3N2) increasing and exceeding that of the pandemic A(H1N1)

Global Virological Surveillance - 25 June 2010

Influenza B viruses continued to be predominating in some countries and areas of Northern Hemisphere, including China (69.8% of all influenza detections), Russian Federation (93.7%). Sporadic influenza B activity has also been observed in some other countries.

Sporadic influenza A activity was reported in some countries in the AFRO region, including Cameroon, Kenya and Madagascar, with the proportion of A(H3N2) increasing (15%).


FluNet Report

The total number of specimens reportedly positive for influenza viruses by National Influenza Centres (NICs) from 23 countries was 288. Of these, 88 (30.6%) were typed as influenza A and 200 (69.4%) as influenza B.

From the start of the pandemic in 19 April 2009 to 12 June 2010, the total number of specimens reported positive for influenza by NIC laboratories was 643,702*. Of these, 488,740 (75.9%) were pandemic A(H1N1), 8,915 (1.4%) were seasonal A(H1N1), 32,630 (5.1%) were A(H3N2), 80,620(12.5%) were A (not subtyped) and 32,678(5.1%) were influenza B.


Further Information

The majority of pandemic A(H1N1) 2009 influenza viruses analyzed to date are antigenically and genetically closely related to the recommended vaccine virus A/California/7/2009.

So far, 298 cases associated with oseltamivir resistant pandemic A(H1N1) viruses have been reported by GISN and other partners. All of these viruses showed the H275Y substitution and all remain sensitive to zanamivir. (Click below to obtain more information on oseltamivir resistant viruses)

Weekly update on oseltamivir resistance to pandemic influenza A (H1N1) 2009 viruses [pdf 17kb] [pdf 16kb]


GISN Information - 19 April 2009 to 20th June 2010

Cumulatively 155 countries shared a total of 26,105 specimens (19,866 clinical and 6,239 isolates) with WHO CCs.

WHO, through the GISN, continues monitoring the evolution and global circulation of influenza viruses, including pandemic, seasonal and other influenza viruses infecting, or with the potential to infect humans.

* Some NICs report data to FluNet retrospectively and updates of previous data with new results are frequent.


For more information

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Attachments

WHO, Weekly Virological Update on 30 June 2010 (July 2 2010, edited)

WHO, Weekly Virological Update on 30 June 2010 (July 2 2010, edited)

WHO, Weekly Virological Update on 30 June 2010 (July 2 2010, edited)

[Source: World Health Organization, <cite cite="http://www.who.int/csr/disease/swineflu/laboratory02_07_2010/en/index.html">WHO | Weekly Virological Update on 30 June 2010</cite>. Edited.]

Weekly Virological Update on 30 June 2010 - Virological Surveillance, week no. 24 (13 to 19 June 2010)

Trend of proportions of different type and subtype influenza viruses:


Summary on week 24

  • Overall influenza activity has remained at low levels in most parts of the world.
  • In Northern Hemisphere the number of influenza type B virus detections exceeded that of influenza A.
  • However, the detection of influenza A increased in South Hemisphere with the co-circulation of A(H1N1)2009 pandemic virus and seasonal A(H3N2).

Global Virological Surveillance

Influenza B viruses continued to be predominating in some countries and areas of Northern Hemisphere, including China (69.7% of all influenza detections) and Russian Federation (86.7%). Sporadic influenza B activity has also been observed in some other countries.

Sporadic influenza A activity was reported in some countries in the Southern Hemisphere, including Australia, Brazil, Chile and South Africa.

The proportion of A(H3N2) increased in Australia and South Africa while A(H1N1)2009 pandemic virus was reported as predominant virus in Brazil and Chile.


FluNet Report

The total number of specimens reportedly positive for influenza viruses by National Influenza Centres (NICs) from 20 countries was 218. Of these, 117 (53.7%) were typed as influenza A and 101 (46.3%) as influenza B.

From the start of the pandemic in 19 April 2009 to 19 June 2010, the total number of specimens reported positive for influenza by NIC laboratories was 644,883*. Of these, 489,229 (75.9%) were pandemic A(H1N1), 8,923 (1.4%) were seasonal A(H1N1), 32,897 (5.1%) were A(H3N2), 80,669(12.5%) were A (not subtyped) and 33,046(5.1%) were influenza B.


Further Information

The majority of pandemic A(H1N1) 2009 influenza viruses analyzed to date are antigenically and genetically closely related to the recommended vaccine virus A/California/7/2009.

So far, 298 cases associated with oseltamivir resistant pandemic A(H1N1) viruses have been reported by GISN and other partners. All of these viruses showed the H275Y substitution and all remain sensitive to zanamivir.

(Click below to obtain more information on oseltamivir resistant viruses)

Weekly update on oseltamivir resistance to pandemic influenza A (H1N1) 2009 viruses [pdf 17kb] [pdf 17kb]


GISN Information - 19 April 2009 to 30th June 2010

Cumulatively 155 countries shared a total of 26, 430 specimens (20,128 clinical and 6,302 isolates) with WHO CCs.

WHO, through the GISN, continues monitoring the evolution and global circulation of influenza viruses, including pandemic, seasonal and other influenza viruses infecting, or with the potential to infect humans.

* Some NICs report data to FluNet retrospectively and updates of previous data with new results are frequent.


For more information

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Attachments

WHO, Weekly Influenza Virological Update on 7 July 2010 (edited): 298 oseltamivir-resistant H1N1pdm detected so far.

WHO, Weekly Influenza Virological Update on 7 July 2010 (edited): 298 oseltamivir-resistant H1N1pdm detected so far.

WHO, Weekly Influenza Virological Update on 7 July 2010 (edited)

[Source: World Health Organization, <cite cite="http://www.who.int/csr/disease/swineflu/laboratory09_07_2010/en/index.html">WHO | Weekly Virological Update on 7 July 2010</cite>. Edited.]

Weekly Virological Update on 7 July 2010 - Virological Surveillance, week n? 25-2010 (20 to 26 June 2010)

Trend of proportions of different type and subtype influenza viruses:


Summary on week 25

  • Overall influenza activity has remained at low levels in most parts of the world.
  • In the Northern Hemisphere the number of influenza type B virus detections exceeded that of influenza A.
  • In the Southern Hemisphere, there is an observation of increasing number of influenza A virus detections with co-circulation of pandemic A(H1N1) and seasonal A(H3N2) viruses.

Global Virological Surveillance

At low levels, influenza B viruses continued to be predominating in some countries and areas of Northern Hemisphere, including China (69.3% of all influenza detections) and Russian Federation (93.7%). Sporadic influenza B activity has also been observed in some other countries.

Sporadic influenza A activity was reported in some countries in the Southern Hemisphere, including Australia, Brazil and South Africa. The proportion of A(H3N2) increased in South Africa (53% of all detections) while pandemic A(H1N1) virus was reported as predominant in Brazil (93.8%). In Australia the proportion of co-circulation of pandemic A(H1N1) and seasonal A(H3N2) viruses is very similar (58.3% and 41.7% of all detection, respectively).


FluNet Report

The total number of specimens reportedly positive for influenza viruses by National Influenza Centres (NICs) from 29 countries was 356. Of these, 194 (54.5%) were typed as influenza A and 162 (45.5%) as influenza B.

From the start of the pandemic in 19 April 2009 to 26 June 2010, the total number of specimens reported positive for influenza by NIC laboratories was 647,378*. Of these, 490,415 (75.8%) were pandemic A(H1N1), 8,946 (1.4%) were seasonal A(H1N1), 33,509 (5.2%) were A(H3N2), 80,737(12.5%) were A (not subtyped) and 33,645(5.2%) were influenza B.


Further Information

The majority of pandemic A(H1N1) 2009 influenza viruses analyzed to date are antigenically and genetically closely related to the recommended vaccine virus A/California/7/2009.

So far, 298 cases associated with oseltamivir resistant pandemic A(H1N1) viruses have been reported by GISN and other partners. All of these viruses showed the H275Y substitution and all remain sensitive to zanamivir. Click here to obtain more information on oseltamivir resistant viruses.

Weekly update on oseltamivir resistance to pandemic influenza A (H1N1) 2009 viruses [pdf 17kb] [pdf 16kb]


GISN Information - 19 April 2009 to 7th July 2010

Cumulatively 155 countries shared a total of 26, 437 specimens (20,128 clinical and 6,309 isolates) with WHO CCs.

WHO, through the GISN, continues monitoring the evolution and global circulation of influenza viruses, including pandemic, seasonal and other influenza viruses infecting, or with the potential to infect humans.

* Some NICs report data to FluNet retrospectively and updates of previous data with new results are frequent.


For more information:

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------
 

Attachments

WHO, Weekly Virological Update on 14 July 2010 (edited): 298 oseltamivir-resistant H1N1pdm detected so far.

WHO, Weekly Virological Update on 14 July 2010 (edited): 298 oseltamivir-resistant H1N1pdm detected so far.

WHO, Weekly Virological Update on 14 July 2010 (edited)

[Source: World Health Organization, <cite cite="http://www.who.int/csr/disease/swineflu/laboratory16_07_2010/en/index.html">WHO | Weekly Virological Update on 14 July 2010</cite>. Edited.]

Weekly Virological Update on 14 July 2010 - Virological Surveillance, week n? 26-2010 (27 June to 3 July 2010)

Trend of proportions of different type and subtype influenza viruses:


Summary on week 26

  • Overall influenza activity has remained at low levels in most parts of the world.
  • In the Southern Hemisphere, increasing number of influenza A virus detections have been reported with co-circulation of pandemic A(H1N1) and seasonal A(H3N2) viruses.
  • Influenza type B virus detections have decreased.

Global Virological Surveillance

Overall influenza activity has remained low with detection of 54.6% pandemic influenza A(H1N1) of influenza A viruses subtyped globally. Sporadic influenza A activity was reported in some countries, including Australia, Brazil, China and Singapore with co-circulation of pandemic A(H1N1) and A(H3N2) viruses. In Australia, the proportion of pandemic A(H1N1) (88.9 %) was significantly higher than seasonal A(H3N2) viruses (11.1%). Brazil reported sporadic pandemic A(H1N1) detections. Sporadic influenza B activity has been observed in some countries with decreased detections in China (56.9% of all influenza detections).


FluNet Report

The total number of specimens reportedly positive for influenza viruses by National Influenza Centres (NICs) from 24 countries was 308. Of these, 181 (58.8%) were typed as influenza A and 127 (41.2%) as influenza B.

From the start of the pandemic in 19 April 2009 to 3 July 2010, the total number of specimens reported positive for influenza by NIC laboratories was 648,936*. Of these, 490,566 (75.6%) were pandemic A(H1N1), 8,946 (1.4%) were seasonal A(H1N1), 34,610 (5.3%) were A(H3N2), 80,839 (12.5%) were A (not subtyped) and 33,848(5.2%) were influenza B.


Pandemic virus characterization - 19 April 2009 to 7th July 2010

Cumulatively 155 countries shared a total of 26, 466 specimens (20,128 clinical and 6,338 isolates) with WHO CCs.

The majority of pandemic A(H1N1) 2009 influenza viruses analyzed to date are antigenically and genetically closely related to the recommended vaccine virus A/California/7/2009.

So far, 298 cases associated with oseltamivir resistant pandemic A(H1N1) viruses have been reported by GISN and other partners. All of these viruses showed the H275Y substitution and all remain sensitive to zanamivir. See below to obtain more information on oseltamivir resistant viruses.

Weekly update on oseltamivir resistance to pandemic influenza A (H1N1) 2009 viruses [pdf 17kb] [pdf 16kb]


GISN Information

WHO, through the GISN, continues monitoring the evolution and global circulation of influenza viruses, including pandemic, seasonal and other influenza viruses infecting, or with the potential to infect humans.

* Some NICs report data to FluNet retrospectively and updates of previous data with new results are frequent.


For more information:

-
-----
 

Attachments

WHO, Weekly Influenza Virological Update on 21 July 2010 (edited): 302 oseltamivir-resistant H1N1pdm detected so far.

WHO, Weekly Influenza Virological Update on 21 July 2010 (edited): 302 oseltamivir-resistant H1N1pdm detected so far.

WHO, Weekly Influenza Virological Update on 21 July 2010 (edited)

[Source: World Health Organization, <cite cite="http://www.who.int/csr/disease/swineflu/laboratory23_07_2010/en/index.html">WHO | Weekly Virological Update on 21 July 2010</cite>.]

Weekly Virological Update on 21 July 2010 - Virological Surveillance, week n? 27-2010 (4 July to 10 July 2010)


Trend of proportions of different type and subtype influenza viruses:


Summary on week 27

  • Overall influenza activity has remained at low levels in most parts of the world.
  • In the Southern Hemisphere, co-circulation of pandemic A(H1N1) and seasonal A(H3N2) viruses has been reported.
  • Influenza type B virus detections have decreased.

Global Virological Surveillance

Overall influenza activity has remained low. Globally 69,1% of the subtyped influenza A viruses were pandemic influenza A(H1N1). Influenza A activity was reported in some countries, including Australia, Chile, China, Ghana, Singapore and South Africa with co-circulation of pandemic A(H1N1) and A(H3N2) viruses. Sporadic influenza B activity has been observed in some countries with decreased detections in China (46.8% of all influenza detections).


FluNet Report (For the week 4 July to 10 July 2010)

The total number of specimens reportedly positive for influenza viruses by National Influenza Centres (NICs) from 15 countries was 320. Of these, 220 (69%) were typed as influenza A and 100 (31%) as influenza B.

From the start of the pandemic in 19 April 2009 to 10 July 2010, the total number of specimens reported positive for influenza by NIC laboratories was 649,983*. Of these, 490,946 (75.5%) were pandemic A(H1N1), 8,956 (1.4%) were seasonal A(H1N1), 34,711 (5.3%) were A(H3N2), 81,000 (12.5%) were A (not subtyped) and 34,243(5.3%) were influenza B.


Pandemic virus characterization - 19 April 2009 to 18th July 2010

Cumulatively 155 countries shared a total of 26, 478 specimens (20,128 clinical and 6,350 isolates) with WHO CCs.

The majority of pandemic A(H1N1) 2009 influenza viruses analyzed to date are antigenically and genetically closely related to the recommended vaccine virus A/California/7/2009.

So far, 302 cases associated with oseltamivir resistant pandemic A(H1N1) viruses have been reported by GISN and other partners. All of these viruses showed the H275Y substitution and all remain sensitive to zanamivir. Click here to obtain more information on oseltamivir resistant viruses.

Weekly update on oseltamivir resistance to pandemic influenza A (H1N1) 2009 viruses [pdf 17kb] [pdf 18kb]


GISN Information

WHO, through the GISN, continues monitoring the evolution and global circulation of influenza viruses, including pandemic, seasonal and other influenza viruses infecting, or with the potential to infect humans.

* Some NICs report data to FluNet retrospectively and updates of previous data with new results are frequent.


For more information:

-
------
 

Attachments

Archive - WHO, Pandemic Influenza H1N1 2009 - Weekly virological surveillance (until the end of July 2010)

This thread contains recent WHO updates about virological surveillance of Pandemic Influenza H1N1 viruses.
 
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