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For the first time in history, we can track the evolution of a pandemic in real-time... Influenza viruses are notorious for their rapid mutation and unpredictable behaviour.

"Influenza A(H1N1)". www.who.int. April 29, 2009.
For the first time in history, we can track the evolution of a pandemic in real-time... Influenza viruses are notorious for their rapid mutation and unpredictable behaviour.