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powerful antibiotics, posing a major threat to human health. the new antibiotic, zosurabalpin, defeated one of the toughest of all superbugs. it's called carbapenem—resista nt acinetobacter baumannii, or crab for short. it's one of the three most critical drug—resistant pathogens, according to the world health organization, because it's so hard to kill. crab thrives in hospitals, where it preys on patients with already weakened immune systems. it's resistant to nearly all antibiotics and has a mortality rate of around 50%. archive: a life-saving drug which has revolutionised - medical science. since the discovery of the first antibiotic — penicillin — these precious drugs have saved countless lives. but there's been no new class of antibiotics against the most resistant bacteria, known as "gram—negative", in over 50 years.