Now three more states have reported ill people: Iowa, Nebraska, and OR, the CDC said.
The last shipments of romaine lettuce from the Yuma growing region were harvested on April 16, and the harvest season is over, the U.S. Food and Drug Administration said.
Twenty-three more people fell ill since the last update on May 9, bringing the total to 172 people from 32 states, the Centers for Disease Control and prevention (CDC) said on Wednesday. Therefore, it is unlikely that the romaine lettuce from the affected Yuma region is still being used in restaurants or stores as it has a shelf life of 21 days. Researchers say that they have dozens of farms under supervision that might spread the bacteria through romaine lettuce and are under the provision.
Talk to your doctor if you have symptoms of an E. coli infection and report your illness to your local health department.
The CDC said three more states - Iowa, Nebraska and OR - have been hit by the outbreak, bringing the total number of affected states to 32.
Stan Park, the operations director of Brandeis Sodexo, verified in an email to the Justice that the food service provider received written confirmation from Russo's, their produce supplier, that Brandeis' romaine comes from Salinas Valley, California instead of Yuma, Arizona.
The FDA, he tweeted, "ruled out that the contamination was caused by just one farm suggesting it was a complex problem and will take further time to investigate". The one death was in California. The Washington Post likened it to a 2006 E. coli outbreak in baby spinach, which eventually made more than 200 people ill.
At least 75 people have been hospitalized, including 20 with kidney failure.
The Public Health Agency of Canada has identified people in several Canadian provinces infected with the same DNA fingerprint of E. coli O157:H7.