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Actually, there are valid reasons for using leeches - but as the scientific method wasn't exactly well known they were used regardless of condition and patient status. Same with maggots. I'm trying to recall where it came from but there's a certain what goes round comes back with medical treatments. We're just in one phase at the moment - the phase where there's a pill for every ill. So who's to say what it will be in the future - for a start it looks like it will be antibiotic-free which means surgery will be used as a last resort.
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