NEW DELHI (AFP) - Urgent global action is needed to prevent the spread of a multi-drug-resistant "superbug" after it was found in water supplies in the Indian capital, doctors said in research published Thursday. The study in The Lancet medical journal said that New Delhi metallo-beta-lactamase 1 (NDM-1) producing bacteria were found in 51 out of 171 samples taken from water pools and rivulets and two out of 50 tap water samples in the city. NDM-1, first identified in 2009, is a gene that enables some types of bacteria to be highly resistant to almost all antibiotics.