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2009 influenza A (H1N1) pandemic

Infectious disease

The 2009 influenza A(H1N1) pandemic was declared over in August 2010 by the World Health Organization. Europe has now entered a new inter-pandemic phase of seasonal influenza.

News

WHO recommendations for influenza virus vaccine composition for the 2018 southern hemisphere influenza season

ECDC comment -

News

Update on narcolepsy cases associated with Pandemrix vaccination in 2009 in the Netherlands

ECDC comment -

News

No Serological Evidence of Influenza A H1N1pdm09 Virus Infection as a Contributing Factor in Childhood Narcolepsy after Pandemrix™ Vaccination Campaign in Finland

ECDC comment -

News

New Swedish Registry study confirms increased risk of narcolepsy in children and adolescents after vaccination with Pandemrix

ECDC comment -

News

Association of receipt of Pandemrix™ and narcolepsy in children and adolescents in the UK (England)

ECDC comment -

News

WHO recommendations for influenza virus vaccine composition for the 2018 southern hemisphere influenza season

ECDC comment -

News

Update on narcolepsy cases associated with Pandemrix vaccination in 2009 in the Netherlands

ECDC comment -

News

No Serological Evidence of Influenza A H1N1pdm09 Virus Infection as a Contributing Factor in Childhood Narcolepsy after Pandemrix™ Vaccination Campaign in Finland

ECDC comment -

News

New Swedish Registry study confirms increased risk of narcolepsy in children and adolescents after vaccination with Pandemrix

ECDC comment -

News

Association of receipt of Pandemrix™ and narcolepsy in children and adolescents in the UK (England)

ECDC comment -

Publication

Threat Assessment Brief: Eurasian avian-like A(H1N1) swine influenza viruses

Risk assessment -

Peer-Reviewed Publication

Alternating patterns of seasonal influenza activity in the WHO European Region following the 2009 pandemic, 2010-2018

Apr 2020

Publication

Guide to revision of national pandemic influenza preparedness plans: Lessons learned from the 2009 A(H1N1) pandemic

Technical report -

Peer-Reviewed Publication

Decreased effectiveness of the influenza A(H1N1) pdm09 strain in live attenuated influenza vaccines: An observational bias or a technical challenge?

Jan 2016

Peer-Reviewed Publication

Predominance of influenza A(H1N1)pdm09 virus genetic subclade 6B.1 and influenza B/Victoria lineage viruses at the start of the 2015/16 influenza season in Europe

Jan 2016
19 February 2015 - Assessment of human influenza pandemic scenarios in Europe
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06 June 2013 - Critical care surveillance: insights into the impact of the 2010/11 influenza season relative to the 2009/10 pandemic season in England
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11 April 2013 - Prevailing effectiveness of the 2009 influenza A(H1N1)pdm09 vaccine during the 2010/11 season in Sweden
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17 January 2013 - Within-patient emergence of the influenza A(H1N1)pdm09 HA1 222G variant and clear association with severe disease, Norway
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08 November 2012 - Hospitalisation associated with the 2009 H1N1 pandemic and seasonal influenza in Hong Kong, 2005 to 2010
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Questions and answers

What is the influenza A(H1N1)v virus? What is the origin of the 2009 pandemic influenza A(H1N1) virus? What is the difference between the pandemic (H1N1) 2009 and swine influenza?

Timeline on the pandemic (H1N1) 2009

This timeline of the 2009 Influenza Pandemic runs from the first described cases in California in April 2009 to July 10th 2010 when the WHO Director General declared that the pandemic was over.

Threats and outbreaks reports

Page listing outbreak reports for the 2009 influenza A (H1N1) pandemic.

Surveillance reports

Page listing surveillance reports for the 2009 influenza A (H1N1) pandemic.

Prevention and control

Page listing preventive and control measures for the 2009 influenza A (H1N1) pandemic.

Pandemic preparedness

External links to partners with information about the 2009 influenza A (H1N1) pandemic

European Medicines Agency (EMA): Pandemic influenza

World health organization (WHO): Pandemic (H1N1) 2009

Centers for Disease Control and Prevention (CDC): 2009 H1N1 Flu

Public Health Agency of Canada (PHAC): H1N1 Flu Virus