True Leaf Farms has voluntarily recalled bags of romaine sent to Oregon, and possibly Washington and Idaho. The bags were shipped between Sept. 12 and 13 and have a use-by date of Sept. 29, according to the company.
Infections believed to be caused by bacteria contaminated cantaloupes have killed at many as 16 people and sickened dozens of others.
No illnesses caused by the romaine have been reported.
(See an image of the True Leaf bag here)
Listeria can cause fever and muscle aches. It can seriously sicken the elderly, people with comprised immune systems and pregnant women.
Officials have warned that the number of cases will rise as symptoms can take weeks to develop.