MINNEAPOLIS - Minnesota health officials say the salmonella bacteria that has sickened more than 400 people in 43 states has been conclusively linked to peanut butter.
Federal officials say the outbreak may have contributed to three deaths.
State health and agriculture officials said last week they had found salmonella bacteria in a two-kilogram container of King Nut peanut butter at a nursing facility in Minnesota.
Officials tested the bacteria over the weekend and found a genetic match with the bacterial strain that has led to 30 illnesses in Minnesota and others across the U.S.
The common element of all the patients is that they ate peanut butter.
However, Doug Schultz, a spokesman with the Minnesota Department of Health, says the brand of peanut butter couldn't be confirmed in every case.
However, he says the majority of patients consumed the same brand.
"This certainly is one pretty definitive piece of evidence in this case," Heidi Kassenborg of the Minnesota Department of Agriculture said Monday.
The peanut butter was distributed only through food service providers and was not sold directly to consumers.
Officials are concerned the peanut butter is still being used, and Kassenborg urged institutions to toss it out.
A woman in her 70s at a northern Minnesota nursing home died after contracting salmonella, although epidemiologist Stephanie Meyer of the state Health Department said it wasn't clear whether the illness or underlying health problems caused the death.
The woman was not at the facility where the bacteria was initially found.
The Centres for Disease Control, in a release later Monday, said the salmonella poisonings may have contributed to three deaths.
The CDC didn't detail the deaths or where they occurred, and spokesman Dave Daigle said the agency would have no other details Monday.
