Around 26 people developed hemolytic uremic syndrome, a form of kidney failure that can be life-threatening to someone with weakened immune systems, like children and the elderly, according to The Post. The majority of people who fell ill from the outbreak live in California.
E. coli is a group of bacteria found in foods, the environment and in your intestines, according to the CDC. While most strains of E. coli won't make you sick, others can cause a variety of illnesses, including diarrhea, urinary tract infections and respiratory issues.
This latest E. coli outbreak marks the worst since 2006, when around 205 people became ill and five died after contracting E. coli from baby spinach, according to The Post.
Federal investigators determined the E. coli outbreak started with contaminated lettuce grown in Arizona's Yuma region, but they were unable to link the outbreak to a specific farm.