Basic facts about the 2009 pandemic
Origin of the virus, Know facts and known unknowns about Influenza A (H1N1)v, Transmission of the virus.
European 2009 influenza pandemic timeline
This ECDC time-line 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. It describes events from the perspective of European Union and European Economic Area institutions and countries.
Mortality from influenza
Comparing deaths from seasonal and pandemic Influenza. The number of deaths reported from the 2009 influenza A(H1N1) pandemic are sometimes compared to the number of deaths from seasonal influenza. One perspective is that fewer people have died from the 2009 influenza pandemic than from ordinary seasonal influenza. This has led to the 2009 influenza pandemic sometimes been characterised as a mild pandemic, or even as a ‘false pandemic’.
Animals and H1N1
First report of transmission of the pandemic A(H1N1) 2009 influenza virus from humans to birds.
Information for the public
ECDC key messages for the public, Questions and answers, Personal measures to reduce the risk of catching influenza or passing it on, information for travellers.
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Q&A on the 2009 pandemic
Frequently asked questions on pandemic (H1N1) 2009, updated 08 October 2009.
Information for travellers
The 2009 pandemic influenza is being reported from an increasing number of locations all over the world. Therefore, precautionary measures for travellers become increasingly important. Updated 18 May 2009.
Origin of the 2009 pandemic influenza A(H1N1) virus
Influenza A: Single stranded RNA virus with eight different genetic segments, when two viruses co-infect the same cell, new viruses can be produced that contain segments from both parental strains (a re-assortment)...
2009 pandemic timeline
This ECDC time-line of the 2009 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.
Seasonal influenza versus the 2009 pandemic
Table comparing seasonal influenza 2000/1 to 2008/9 and 2009 pandemic influenza, listing the ten characteristics whereby the new pandemic virus differs from the ‘old’ seasonal especially as it appeared in its later years.
Mortality from influenza
Comparing deaths from seasonal and pandemic influenza.
Animals and H1N1
First report of transmission of the pandemic A(H1N1) 2009 influenza virus from humans to birds. |
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Definition of a Pandemic
The emergence of influenza A virus significant different genetically from circulating human influenza A viruses (i.e. many or most of the population are non-immune to the new virus) with the following three characteristics: able to infect humans, able to cause disease in humans, able to spread from human to human quite easily
WHO pandemic phases
Pandemic phase one: No animal influenza virus circulating among animals has been reported to cause infection in humans. Pandemic phase two: An animal influenza virus circulating in domesticated or wild animals is known to have caused infection in humans and is therefore considered a specific potential pandemic threat.
Pandemics of the 20th Century
1918 - 1919 Spanish Influenza, 1957 - 1958 Asian Flu, 1968 - 1969 Hong Kong Flu.
Q&A on pandemic preparedness
What is influenza? What is a pandemic? What happens during a pandemic – how many people are affected? |
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 Swine influenza (classical)
Swine influenza (swine flu) is an acute viral infection of the respiratory tract in pigs, caused by type A influenza virus.
 Influenza pandemic preparedness
Pandemic influenza is a global spread of a new influenza strain to which the general population is not immune.
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