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In an accompanying commentary, microbiologist Mohd Shahid of India’s Aligarh Muslim University wrote that more studies are needed in India to assess how threatening the superbug problem is.

“The potential for wider international spread … is real and should not be ignored,” he wrote.

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Nirmal George and Ashok Sharma contributed to this report from New Delhi.

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Online:

http://www.lancet.com

http://www.who.int

(This version corrects that NDM-1 is a gene, not bacteria.)