Do you see biological methods, as being a powerful tool.
Ie: Fight bacteria, with bacteria. And viruses, with vivuses ?
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I'd say that it's a possibility, IF all the variables are understood. Many times, a lot of micro-organisms are fought with 'by-products' from other micro-organisms ( Antibiotics , for example?).
BUT, to ingest a live specimen to neutralize another one and without understanding the possible consequences fully is a different story, in my opinion.