Tainted irrigation water blamed for E. coli outbreak

NEWYORK— Tainted irrigation water appears to be the source of a national food poisoning outbreak linked to romaine lettuce, health officials said Thursday.

About 200 people were sickened in the E. coli outbreak, and five people died. The outbreak, which started in the spring, is over, the Centers for Disease Control and Prevention said.

The illnesses in 36 states were previously traced to romaine lettuce grown in Yuma, Arizona, which provides most of the romaine sold in the U.S. during the winter.

On Thursday, officials said the outbreak strain of E. coli bacteria was found in an irrigation canal in the Yuma area. They are investigating how the bacteria got into the canal and whether there was contamination elsewhere. They declined to give details about the canal, including its location, until a report can be completed.

“More work needs to be done to determine just how and why this strain of E. coli O157:H7 could have gotten into this body of water and how that led to contamination of romaine lettuce from multiple farms,” said Dr. Scott Gottlieb, commissioner of the U.S. Food and Drug Administration, in a statement.

The outbreak was the nation’s largest E. coli food poisoning outbreak in more than a decade. Most of the people got sick in March and April.