Under a microscope, this drug-resistant superbug looks as benign as a handful of pebbles. Yet carbapenem-resistant Acinetobacter baumannii, or CRAB, is a nightm

Under a microscope, this drug-resistant superbug looks as benign as a handful of pebbles. Yet carbapenem-resistant Acinetobacter baumannii, or CRAB, is a nightmare for hospitals worldwide, as it kills roughly half of all patients who acquire it.