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Can you run that past me again?
Imagine the most sterile protective apron imaginable. A nurse puts it on and a patient coughs and sneezes all over it. If the nurse doesn't change it the next patient is at risk from all the detritus splattered across the apron. The fact that it was sterile when put on does not affect that risk. Having been sterile does not lower it, not having been sterile does not raise it.