Epidemiologists have been warning for years that it's just a matter of time before a new strain of the flu emerges that has the potential to kill millions. Flu pandemics have historically occurred about three times per century and the world hasn't seen one in more than 40 years.
If an influenza virus changes and becomes a new strain against which people have little or no immunity -- and this new strain is easily spread from person to person -- many people around the world could become ill and die.
The World Health Organization estimates that in the best case scenario, the next pandemic could kill two to seven million people and send tens of millions to hospital.
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