They're nanoparticles that tear apart the targeted bacteria, while leaving other cells alone. So far there doesn't appear to be a way that resistance to them could be developed over time.
The technology is pretty far from clinical trials, having been used so far on six forms of resistant bacteria in the lab and in mice. But the polymers, developed by Shu Lam, a 25-year-old Ph.D. student at the University of Melbourne, sound like they come from the kind of perpendicular thinking that's often necessary to solve problems like this.
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