The FDA has discovered a new outbreak of Listeria infections, but a cause is yet to be determined.

In an updat of ongoing outbreaks, the Food and Drug Administration announced the new outbreak, which has already sickened 16 people. The FDA did not report how many states are involved or when the people became ill.

The agency has begun traceback efforts to find the source of the Listeria, but it has not reported what food or foods are involved in those efforts.

As of Thursday afternoon, the Centers for Disease Control and Prevention had not reported any information on the new outbreak. That is not unusual for the CDC, which tends to wait until a possible cause of infections has been determined.

In other outbreak news, the FDA has begun onsite inspections, as well as traceback and sample analysis in an ongoing outbreak of Salmonella Javiana infections. The outbreak has now sickened at least 51 people. As of this past week, the patient count stood at 42 patients.

As with the new Listeria outbreak, no cause has been identified for the ongoing outbreak of Salmonella Javiana infections. The FDA also has not reported what states are involved or when the first illness was reported.

The table below shows ongoing outbreak investigations being managed by FDA’s CORE Response Teams. The investigations are in a variety of stages. Some outbreaks have limited information with active investigations ongoing, others may be near completion. The table below has been abbreviated to show only active investigations.

The Food and Drug Administration will issue public health advisories for outbreak investigations that result in “specific, actionable steps for consumers — such as throwing out or avoiding specific foods — to take to protect themselves,” according to the outbreak table page.

Not all recalls and alerts result in an outbreak of foodborne illness. Not all outbreaks result in recalls.

Outbreak investigations that do not result in specific, actionable steps for consumers may or may not conclusively identify a source or reveal any contributing factors, according to CORE’s outbreak table page. If a source(s) and/or contributing factors are identified that could inform future prevention, FDA commits to providing a summary of those findings, according to CORE officials.

Click here to visit the FDA page that has a complete list of outbreak investigations and links to outbreak information.