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Hello, sorry for the delay. That's a really old question!
Anyways -- the issue here is that the skin is your body's natural protective barrier.
If it is cut, it usually takes about 24 hours for that first protective layer to form on the top layer of the skin.
So, before that time, theoretically -- you could still have an entry way into the skin for bacteria and viruses. While still very unlikely, that risk would not be zero.