Bacteria are survivors; they have half a dozen fiendishly clever ways of disarming antibiotics. They can chemically modify the drugs themselves, rendering them ineffective; they can pump drugs out of cells before they can interact with their targets, or they can create decoys, so drugs interact with the wrong targets. Bacteria can also close off ports-of-entry so drugs can't get into the cell.
However, given the tendency of bacteria to develop mechanisms of resistance to invading chemicals, there are no guarantees that new...
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