The Centers for Disease Control and Prevention says that person has not identified who died and the infection has sickened a total of 121 people in 25 states in the US.
California had 24 cases reported, the highest number in any state, followed by Pennsylvania with 20 cases and Idaho with 11.
The outbreak is the largest in the United States since 2006, when spinach tainted with a similar strain of E. coli sickened more than 200 people. People who get sick from toxin-producing E. coli come down with symptoms about three to four days after swallowing the germ, with many suffering bloody diarrhea, severe stomach cramps and vomiting.
Health officials said the contamination had been found to romaine lettuce grown in the area around Yuma, Ariz. which is considered as a part of the growing region that produces 90% of the nation's winter lettuce, and which has mostly stopped growing the winter crop.
The bacteria normally live in the intestines of animals, including cows and pigs, and in the 1990s, most E. coli cases were associated with contaminated hamburger. But investigators have not specified when and where that lettuce became contaminated with the risky bacteria, and the farm has not been linked to other cases. The CDC advised restaurants and consumers to avoid romaine unless they confirm it was grown in a different region. Combined, they make up almost half of the reported cases. The newest update includes illnesses starting as recently as April 21.
"I really didn't worry about it and didn't think about it much because putting it in perspective there are so many more things and more hazards in life than worrying about romaine lettuce", said Saint Lawrence County resident Frederick Ogborne.