The CDC is reporting 35 people in 11 states have been infected with E. coli O157:H7, tied to chopped romaine lettuce.
In January, when the affiliation was first reported, 17 people were sick.
The agency says the lettuce in question was grown in the Yuma, Ariz. growing region, but so far no common supplier has been found among the patients.
Twenty-two people have been hospitalized, including three with a type of kidney failure, but no deaths have been reported.
Cases have been reported in Connecticut, Idaho, Illinois, Michigan, Missouri, New Jersey, New York, Ohio, Pennsylvania, Virginia, and Washington.
The CDC recommends throwing away chopped romaine or bagged salads that include it, even if some has already been eaten and nobody has gotten sick. Before purchasing romaine at a store or eating it in a restaurant, consumers should confirm that it has not been sourced from the Yuma growing region.
In its case count update, the CDC noted that illnesses that occurred after March 27 may not have been reported yet, as it takes two to three weeks for symptoms to appear.
For more details and to follow the progress of the outbreak, you can view the CDC report directly.