According to the Washington Post:
Federal health officials issued an advisory about bagged spinach yesterday, saying that a preliminary investigation had linked an outbreak of a particularly harmful strain of the bacteria Escherichia coli 0157:H7 to bagged fresh spinach.
The bacteria can cause severe vomiting and diarrhea. Some people can also develop kidney failure.
More than 50 cases of illnesses have been reported in 10 states, including one death. The death was reported in Wisconsin, where 20 illnesses were reported. Other illnesses were reported in Connecticut, Idaho, Indiana, Kentucky, Michigan, New Mexico, Ohio, Oregon and Utah.