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Why new viruses are more powerful than the old ones? Why we can not be against them?

How much our knowledge about the humans health grows, new and more powerful viruses emerge more!
why we can not stop their emerge?

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    Jun 22 2013: Because nature some times is a better engineer than we human beings. Our immune system combats viruses but viruses adapt themselves to escape our immune system. I guess we have to live with the evolution.

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