Listeria Outbreak Investigation linked to an Unidentified Product (#1380)

United States

Update July 1st, 2026:
The FDA updated the outbreak advisory on June 29, 2026, with investigation updates including a new recall of repackaged requeson cheese.

Source: FDA


Update June 18th, 2026:
The FDA updated the outbreak advisory on June 12 and 15, 2026, to include retail sites of some recalled products, an expanded recall for all Clover Hill Dairy cheese products, and sampling updates.

Source: FDA


Update June 10th, 2026:
The FDA has identified requeson/soft ricotta cheese as the product linked to the ongoing Listeria monocytogenes outbreak (ref #1380). The agency has initiated product sampling as part of the investigation.

Additionally, on June 9, 2026, the FDA updated the outbreak advisory to include information about a downstream recall of affected cheese products and provided updates on ongoing sampling efforts. The investigation remains active as authorities continue to determine the extent of the contamination and monitor for additional cases.

Source: FDA


June 3rd, 2026:
A new outbreak of Listeria monocytogenes has been reported, affecting eight individuals across an unspecified location in the United States. The outbreak, referenced as #1380, is linked to an unidentified product, prompting the FDA to initiate traceback and onsite inspections.

The outbreak is currently active and ongoing, with health authorities working to identify the specific product responsible for the illnesses. Listeria monocytogenes is a serious pathogen that can cause severe illness, particularly in pregnant women, newborns, older adults, and individuals with weakened immune systems. The total case count stands at eight, and efforts are underway to contain the outbreak and prevent further cases.

The problem was discovered through routine surveillance and reporting of foodborne illnesses. The FDA has begun traceback efforts to determine the source of the contamination and has initiated onsite inspections to assess potential points of contamination. These measures are part of the FDA's standard protocol in response to foodborne illness outbreaks, aiming to ensure public safety and prevent additional cases.

Source: www.fda.gov/food/outbreaks-foodborne-illness/investigations-foodborne-illness-outbreaks