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It depends on the specific strain of "Swine Flu". The version that pigs get has probably been around for almost as long as there have been pigs. One version of swine flu in humans was identified in the 1930's. Another started in 1976. The pandemic version of H1N1/09 began in March 2009 and still circulates in outbreaks across the world but the pandemic of this strain has been declared over. See the related question below about when swine flu started for more detail.

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12y ago
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12y ago

You could say it was spread worldwide within only 3 months! It took H1N1/09 approximately 17 months from the start with the first known cases in March 2009 until the pandemic was declared over in August 2010.

Time line:

1st identified case in Mexico made public: March 18, 2009

Officially reported to be in US: April 14, 2009

WHO Pandemic declared: June 11, 2009

Peak of the pandemic had passed according to WHO: June 3, 2010

Pandemic declared over: August 10, 2010

See the related links section below for a link to WikiPedia with a more detailed time line including country by country spread.

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14y ago

The pandemic swine flu has been in the news since late March 2009.

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Q: How long has the influenza virus been aroiund?
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