There is a bacterium that occurs in hospitals that is resistant to virtually every antibiotic. It turns out that the bacterium has another way besides resistance to defend itself. It uses a sonar-like system to hear other cells approaching, such as white blood cells. When it locates the other cells, it kills them with a blast of a toxin. If the white blood cells can't get to the bacterium, it is free to multiply and wreck its havoc. This defense mechanism may prove to be the microbe's Achilles' heel.
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