Since the first reports of what we know now is AIDS, an entire generation has been born and come of age never knowing a world without the epidemic.Plague is no longer an odd thing in morden people's eyes, but in the last 50 years various plagues happened too often. Maybe it's time to think about the logic behind this phnomeon.

From SARS,H5N1 to tick which is popular now. People hardly to prevent these virus from killing millions of people even through the lastest technology. What's worse, with the long incubation period, these virus spread to more and more people.Death walked the streets of the plague-bound city. People finally get threatened.

Some people insist that it's a punishment that god put on human for exploiting the Great Nature wantonly.Maybe it's time to think seriously what we've done to animals, to nature.Maybe it's right time to show some respect to the Great Nature, to ourselves.

Because at last, we human have to take the responsibility of what we've done.