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The surge was assumed by authorities to be "late-season flu" (which usually coincides with a mild Influenzavirus B peak [19]) until April 21, [20] [21] when a CDC alert concerning two isolated cases of a novel swine flu was reported in the media (see 2009 swine flu outbreak in the United States). [22]
On 3 May 2009, the first case of the flu in South America was confirmed in a Colombian man who recently travelled from Mexico – since then, it has spread throughout the continent. By far, the most affected country has been Chile , with more than 12,000 confirmed cases, 104 deaths, and the highest per capita incidence in the world.
The 2009 swine flu pandemic, caused by the H1N1/swine flu/influenza virus and declared by the World Health Organization (WHO) from June 2009 to August 2010, was the third recent flu pandemic involving the H1N1 virus (the first being the 1918–1920 Spanish flu pandemic and the second being the 1977 Russian flu).
The pandemic H1N1/09 virus is a swine origin influenza A virus subtype H1N1 strain that was responsible for the 2009 swine flu pandemic. This strain is often called swine flu by the public media due to the prevailing belief that it originated in pigs. The virus is believed to have originated around September 2008 in central Mexico.
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It happened again in 2009, when a human and swine flu switched genes, unleashing the H1N1 swine flu outbreak that killed roughly 500,000 people. Already there is evidence this virus is swapping genes.
First known death due to what was later identified as swine flu origin. 24 April First Diseases Outbreak Notice mention of the Swine Flu by the World Health Organization. 25 April The United States is the first country to have Community outbreaks confirmed. Community outbreaks confirmed in Mexico. 27 April First case confirmed in Canada.
Even as the United States grapples with an outbreak of H5N1 flu in dairy cattle, the World Health Organization has announced the first known human infection with a different strain, H5N2, in a ...