The Food and Drug Administration is investigating a new outbreak of infections caused by Listeria monocytogenes.

As of Dec. 6 the agency had not determined a source for the outbreak, which has three confirmed patients. The Centers for Disease Control and Prevention has not posted any information on the outbreak.

The FDA has not reported wher the patients live or their ages.

No traceback or sampling has begun, according to the FDA’s initial outbreak information.

In other news, the FDA continues to investigate an outbreak of Salmonella Newport and Oranienburg infections of unknown origin. Another patient has been identified, bringing the total of sick people to 43. The agency first reported the outbreak on Nov. 22.

In another outbreak investigation, caused by E. coli O121, the FDA has initiated on-site inspection and collect of samples for testing. However, the agency has not reported what location is being inspected or what food is being tested. The FDA reports 37 people have been infected in the outbreak, which the agency first reported on Nov. 1.

The FDA has closed its investigation of an outbreak of E. coli O103 infections that sickened 12 people without finding a source of the pathogen. The outbreak has been declared over. The agency first reported on the outbreak on Nov. 5.