The U.S. Food and Drug Administration expanded a recall of raw milk cheese on Monday after the Centers for Disease Control and Prevention linked new E. coli illnesses to the product across additional states beyond the original Oregon case. The agency urged consumers to discard affected lots.

The outbreak first drew national attention over the weekend, when the CDC reported 13 illnesses and eight hospitalizations tied to raw milk cheese sold in Oregon. Federal investigators traced the contamination to a single producer and warned that the product had been distributed more widely than initially believed.

The FDA said laboratory testing identified Shiga toxin-producing E. coli in samples of the cheese. The agency advised retailers and restaurants to remove all affected lots from shelves.

The CDC recommended that anyone experiencing severe stomach cramps, bloody diarrhea or vomiting seek medical care immediately.

Public health officials renewed longstanding warnings against consuming unpasteurized dairy products, which the FDA says carry a heightened risk of harboring pathogens including E. coli, Listeria and Salmonella. Children, older adults and people with weakened immune systems face the greatest danger of serious complications.

The FDA said the agency was continuing its traceback investigation with state health departments and would update the recall as testing proceeds. Consumers who purchased the recalled cheese were told not to eat it and to sanitize any surfaces it may have contacted.