How H1N1 kicked off a 91-year pandemic era

Ed Young over at Not Exactly Rocket Science has an Infectious-themed post:

From Spanish to swine - how H1N1 kicked off a 91-year pandemic era

• The swine flu pandemic (S-OIV) currently sweeping the world is the result of an influenza H1N1 virus that made the leap from pigs to humans. But this jump is just the latest leg of a journey that has taken over 90 years and shows no signs of finishing.
  Today's pandemic is a fourth-generation descendant of the 1918 flu
  virus that infected around a third of the world's population.

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