Minnesota, Florida and North Dakota have also been added to the list.
On Saturday, April 21, the company wanted to remain transparent with their customers, so they alerted them through social media and through an e-newsletter with information about the outbreak and the restaurant's position. Illnesses that occurred in the last two to three weeks might not yet be reported because of the time between when a person becomes ill with E. coli and when the illness is reported to CDC.
At least 64 people have been hospitalized, including 17 with kidney failure.
This strain of bacteria, called E. coli O157:H7, produces Shiga toxin, according to the CDC.
It's unclear where or how many people have been infected in Florida.
Diarrhea from E. coli O157 shouldn't be treated with antibiotics, because that might promote the development of HUS, according to the health department.
"Product labels often do not identify growing regions; so, do not eat or buy romaine lettuce if you do not know where it was grown", as the CDC site puts it.
SAN RAFAEL, CA - APRIL 23: Romaine lettuce is displayed on a shelf at a supermarket on April 23, 2018 in San Rafael, California.
Romaine from the Yuma growing region should no longer be on sale; however, individuals should check their refrigerators for romaine lettuce grown earlier in season in the Yuma region.
Public health officials in the affected states were investigating the outbreak. Last week, it identified Harrison Farms as the source of a single outbreak at a correctional facility in Nome, Alaska, that sickened eight inmates. The farm is now growing grass where the lettuce once was. Therefore, it is not being sold or served anymore. Leafy greens such as romaine are grown, packed and shipped by different companies before reaching retails stores and restaurants, making it more hard to pinpoint where the food became contaminated. "This advice includes whole heads and hearts of romaine, chopped romaine, baby romaine, organic romaine, and salads and salad mixes containing romaine lettuce".
Caesar salads are once again beckoning you, tempting you with their leafy green crunch, but it is safe to eat romaine again after the latest outbreak of E. coli?