Santa Maria, California – Source of the E. coli strain from the romaine lettuce outbreak found in sediments from an agricultural water lake at a farm in Santa Maria, the US Food and Drug Administration and US Centers for Disease Control and Prevention said on Thursday.
Officials said one sample of Adam Brothers Farming Co. Ltd. tested positive for the strain outbreak of E. coli. All the lettuce from human brother farms is now remembered.
The ranch is run by Richard Rich, Kieran, Dominic, and Peter Adam, who is the fourth district county of Santa Barbara County.
However, officials have warned that this finding does not fully explain the outbreak and therefore the investigation continues.
"We do not believe that this is the only place involved in the outbreak," said Steven Ostroff, senior adviser to the FDA commissioner.
The FDA said it has been able to further reduce the list of suspected areas that grow as part of this outbreak and therefore have updated advice to consumers.
Lettuce Romain Monterey, San Benito and Santa Barbara Counties should continue to be avoided as well as any romaine lettuce that is not marked with a harvest date and location.
So far, 59 diseases in 15 US states have been reported in this outbreak, the center said.
CNN's Sandee LaMotte and Debra Goldschmidt CNN Health contributed to this report.