A worker checks out a chick at a poultry farm in Hefei, eastern China's Anhui province on November 20, 2015. Scientists warned of the "epidemic potential" of deadly and fast-spreading bacteria resistant to last-line antibiotics. The superbugs were detected during routine health testing of pigs and chickens in southern China. The animals were found to be carrying bacteria resistant to colistin, an antibiotic widely used in livestock farming. CHINA OUT AFP PHOTO (Photo credit should read STR/AFP via Getty Images)
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