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What You Should Know: Swine Flu Outbreak 2009

While the flu is always being passed around the human population, it hardly ever reaches epidemic proportions; however, in the 20th century there have been three flu pandemics. What causes a flu pandemic to occur is when a new strain of the virus arises that most people have no immunity to. World health officials are vigilantly watching the ongoing swine flu outbreaks in Mexico and the U.S. to see if they might set off the next one.