I've only seen that once. The patient had some nasty diabetic ulcers on their legs that just wouldn't heal and using general anesthesia was deemed a bit too risky. They used the maggots to clean out the wound, then used artificial skin to cover it. This was done at a hospital in Boston as I was working at a small community hospital at the time. The patient was admitted there over night for other reasons. The Boston hospital sent a wound nurse down to change the dressing as it was still "experimental" at the time.
Haven't seen it, or even thought of it, in quite some time now.
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