A new superbug that is resistant to even the most powerful antibiotics has entered UK hospitals, experts warn.
They say bacteria that make an enzyme called NDM-1 have travelled back with NHS patients who went abroad to countries like India and Pakistan for treatments such as cosmetic surgery.
Although there have only been about 50 cases identified in the UK so far, scientists fear it will go global.
Tight surveillance and new drugs are needed says Lancet Infectious Diseases.
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Analysis
Geeta Pandey BBC News, Delhi
The Indian health ministry and the medical fraternity are yet to see the Lancet report but doctors in India say they are not surprised by the discovery of the new superbug.
"There is little drug control in India and an irrational use of antibiotics," Delhi-based Dr Arti Vashisth told the BBC.
Doctors say common antibiotics have become ineffective in India partly because people can buy them over the counter and indulge in self-medication. They also take small doses and discontinue treatment.
Gastroenterologist Vishnu Chandra Agarwal says in the past year he has come across many patients with E.coli infections who have not responded to regular antibiotics.
"In about a dozen cases, I have used a chemical - furadantin - to treat my patients. And it has worked. It makes them horribly nauseous, but it works," he says.
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