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Federal and state health officials said Monday that salmonella linked last week in Minnesota to King Nut peanut butter was caused by the same strain of bacteria responsible for an ongoing outbreak of 410 salmonella cases in 43 states.

The infection may have contributed to three deaths, the Centers for Disease Control and Prevention said Monday.

"Preliminary analysis of an epidemiologic study conducted by CDC and public health officials in multiple states comparing foods eaten by ill and well persons has suggested peanut butter as a likely source," the disease agency said in a written statement. "To date, no association has been found with common brand names of peanut butter sold in grocery stores."

A spokesman for the Food and Drug Administration said Monday that the agency has been collaborating with the CDC, the U.S. Department of Agriculture and public health officials in many states to investigate the outbreak of infections due to Salmonella enterica serotype Typhimurium.

"This new information from Minnesota will not change what we are currently doing as part of the investigation," said FDA spokesman Michael Herndon. What you need to know about food poisoning Read full article »

CNN's Louise Schiavone and Miriam Falco contributed to this story.

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