Mysteries of the Flu

From www.newsweek.com:

There is a joke among flu researchers: "If you've seen one flu season, you've seen…one flu season." The translation, for those not up on epidemiological humor: the joke is wry commentary on the unpredictable nature of the flu virus. Every year it looks different, and every strain follows its own pattern. This is not just a quirk that frustrates scientists—it's the reason new strains like H1N1 are impossible to anticipate and fully prepare for.

...

Read the complete article: Mysteries of the Flu