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Justin Sullivan/Getty ImagesRomaine lettuce is displayed, May 2, 2018, in San Anselmo, Calif.
Thirteen people were hospitalized, including one person who developed kidney failure, specifically hemolytic uremic syndrome, the agency said, adding that no deaths have been reported.
In Canada, the Public Health Agency has identified 18 people infected with the same DNA fingerprint of E. coli O157:H7 bacteria in two provinces, Ontario and Quebec, according to the CDC statement.
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The agency said that those sickened in this outbreak are infected by the same strain as patients from a 2017 E. coli outbreak linked to leafy greens in the United States and romaine lettuce in Canada. However, this current outbreak is not connected to the recent multi-state outbreak of E. coli O157:H7 infections linked to romaine lettuce.