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Worldwide mortality estimates range all the way from 2-7.4 million deaths (the "conservatively low" pandemic influenza calculation of a flu modeling expert at the U.S. Centers for Disease Control and Prevention) to 1000 million deaths (the bird flu pandemic prediction of one Russian virologist).
Avian influenza, also known as avian flu or bird flu, is a disease caused by the influenza A virus, which primarily affects birds but can sometimes affect mammals including humans. [1] Wild aquatic birds are the primary host of the influenza A virus, which is enzootic (continually present) in many bird populations.
Influenza A virus subtype H5N1 (A/H5N1) is a subtype of the influenza A virus, which causes the disease avian influenza (often referred to as "bird flu"). It is enzootic (maintained in the population) in many bird populations, and also panzootic (affecting animals of many species over a wide area). [1]
It was not until 1 February that the deaths were reported to Defra. The farm was sealed off while tests were carried out, on samples taken from the dead birds, at the Veterinary Laboratories Agency in Weybridge, Surrey. Another 1,500 birds died on 2 February. [12] Then on 3 February 2007 the H5N1 causation was confirmed. [13]
In September, Egypt and Sudan joined the list of nations seeing a resurgence of bird deaths due to H5N1. [citation needed] In November and December, South Korea and Vietnam joined the list of nations seeing a resurgence of bird deaths due to H5N1; February/March 2006 - A dead cat infected with the H5N1 bird flu virus was found in Germany. [26]
Epidemics and pandemics with at least 1 million deaths Rank Epidemics/pandemics Disease Death toll Percentage of population lost Years Location 2 1918 Flu: Influenza A/H1N1: 17–100 million 1–5.4% of global population [4] 1918–1920 Worldwide 2 Plague of Justinian: Bubonic plague 15–100 million 25–60% of European population [5] 541–549
Thousands of birds and animals were being culled in Germany to stop the spread. [11] In the United Kingdom the flu was found in a wild duck at a turkey farm in Lincolnshire. [12] In South Korea, a record total of 18.4 million birds had been killed by December since the first outbreak of avian flu was reported at a farm on Nov. 18. [13]
This is a timeline of influenza, briefly describing major events such as outbreaks, epidemics, pandemics, discoveries and developments of vaccines.In addition to specific year/period-related events, there is the seasonal flu that kills between 250,000 and 500,000 people every year and has claimed between 340 million and 1 billion human lives throughout history.