One, a toddler, was hospitalized after he developed hemolytic uremic syndrome, a type of kidney failure that is a potentially deadly E. coli complication.

Four of the children developed hemolytic uremic syndrome (HUS), which resulted in varying degrees of permanent kidney damage.

Of the 171 cases that have been confirmed as part of the spinach outbreak, more than half required hospitalization, and about 16 percent developed the dangerous hemolytic uremic syndrome.