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flag Polymyxin antibiotics kill only growing bacteria by overloading their outer layer, leaving dormant ones untouched, a study finds.

flag A new study reveals that polymyxin antibiotics, used against drug-resistant bacteria, only kill actively growing bacteria by tricking them into overproducing their protective outer layer, causing structural collapse. flag Dormant bacteria, which stop producing this armor, remain unaffected. flag Researchers used high-resolution imaging to observe this process in real time, showing that reintroducing nutrients like sugar can wake dormant cells, making them vulnerable again after a 15-minute delay. flag The findings, published in Nature Microbiology, challenge the belief that these antibiotics work on all bacterial states and suggest combining them with agents that stimulate bacterial activity could improve treatment for persistent infections.

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