Walt,
As I remember my college biology classes (probably should remember more, since it was my major), isn't tetanus a danger primarily in puncture wounds? I seem to recall learning that it wasn't a problem if the wound was bleeding freely (which, let's face it, most knifeknut wounds are going to be).
Besides, the first thing they do in the emergency room, for even the tiniest scratch, is give you a tetanus shot.
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Dave
Life, Liberty and the Pursuit of More Knives