Ask flu experts about their worst nightmare and they may tell you something like this. Somewhere in Asia, a new flu virus is born that's able to jump from one human to the next, yet is cloaked in avian proteins that human immune systems have never seen before. Laying low at first, the virus sickens and kills a small number of people, while it's getting better at the human-to-human transmission game. When authorities finally notice the expanding cluster of flu cases, the virus has already moved on. It takes advantage of flights that connect Asia's major cities to the rest of the world, popping up simultaneously in Sydney, Los Angeles, and London.
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