Health officials on Thursday said that a bad batch of romaine lettuce that caused an E. coli outbreak was traced back to a farm in central California.

The Centers for Disease Control warned lettuce eaters not to consume romaine that was grown in Monterey, San Benito and Santa Barbara.

A water reservoir at a farm in Santa Barbara County tested positive for the bacterial strain, the CDC said.

Officials said that if you don’t know where the lettuce is from – don’t eat it.

The information came after 59 people in 15 states have been sickened by the tainted lettuce.

E. coli, the bacteria often associated with food poisoning, usually causes sickness two to eight days later, according to health authorities.

Most people with the infection get diarrhea and abdominal cramps. Some cases can be life-threatening, causing kidney failure and seizures.

With Post wires