The U.S. Food and Drug Administration and the Centers for Disease Control and Prevention are recommending against eating raw alfalfa sprouts because of potential salmonella contamination.

According to the FDA, the salmonella contamination appears to be in seeds for alfalfa sprouts. As of yesterday, 31 cases of illness with Salmonella Saintpaul have been reported to the CDC. The reported cases are in Michigan, Minnesota, Pennsylvania, South Dakota, Utah, and West Virginia. The FDA cautions that the number of infected people may rise because some illnesses have not yet been confirmed with laboratory testing.

The FDA believes this outbreak may be linked to an outbreak from earlier this year. Its initial investigation traces the contaminated raw alfalfa sprouts to multiple sprout growers in multiple states. Additional details are available here.