Flu season outlook
This year's flu season remains unpredictable amid bird flu fears and pandemic worries. Full story »
Widespread outbreaks in western U.S.
Experts: Pandemic fears premature Is the U.S. prepared for a bad flu season? What we can learn from animals and the flu INTERACTIVE: How a possible superflu is born EXPLAINER: What is avian flu? TIMELINE: Pandemics and scares in history GALLERY: Worst-case scenarios
Shortages in the past spurred calls for new ways to make vaccines. But is anything being done? Full story »
The numbers and facts behind the common cold are sometimes surprising. View gallery »
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