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Worst-case scenariosHealth officials say it's only a matter of time before the next influenza pandemic hits. Gallery »
• Flu season peaks later than usual
• Study: 142 million dead in next pandemic • 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 • Pandemic fears loom over season | Fears premature?  
Shortages in the past spurred calls for new ways to make vaccines. But is anything being done? Full story »
• CDC: Two flu drugs don't work this season
• INTERACTIVE: Flu 101: What you need to know • INTERACTIVE: How a flu vaccine works  |
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The numbers and facts behind the common cold are sometimes surprising. 
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