It's possible, some scientists say.
Recently, three Americans were treated for serious urinary tract infections caused by bacteria carrying a gene that makes them highly resistant to antibiotics.
Bacteria that carry the gene, known as New Delhi metallo-beta-lactamase (NDM-1), are widespread in India, and each of the three Americans had recently spent time there.
One of the Americans sickened by the superbug was treated at Massachusetts General Hospital in Boston. A woman with the superbug was treated in California, and a man with it was treated in Illinois.
All three survived, but not everyone is so lucky.
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