Why USB is dengerous???

Now a days USBs are the most useful way to convey data but now is going unsafe.In burl-an Leel and Noel have discover a clever virus in USB.And they said that there is no way to protect from it. But the experts says that we can protect our computers from this virus by adopt some safeties.This virus will destroy yours computers as slow as in 10 years. They said that now USB is not believable device. Do you know,4 years earlier a virus which disturb Iran nuclear program also comes though USB. Earlier days when there was no USB, floppy disc was use to convey data. I think that for safety there would be floppy in use in future.
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