Clover Hill Dairy has recalled all cheese products manufactured at its Mechanicsville, Maryland facility following a multi-state Listeria monocytogenes outbreak. According to the Centers for Disease Control and Prevention (CDC), the outbreak has resulted in nine illnesses, eight hospitalizations, and one death across multiple states. The recall encompasses various brands, including De Mi Pueblo, Quesos La Ricura, Izalco, and Rio Lindo, due to environmental contamination found at the production plant.
Why the Recall Expanded to All Products
The U.S. Food and Drug Administration (FDA) confirmed that environmental samples taken from the Clover Hill Dairy facility tested positive for Listeria. While the investigation initially focused on requeson—a soft, fresh whey cheese—the discovery of the pathogen within the plant’s operating environment prompted the company to recall its entire catalog. This includes cheddar, colby, monterey jack, pepper jack, and smoked cheese varieties. Because Listeria can persist in manufacturing equipment and facility surfaces, regulators determined that no cheese produced at this site could be considered safe for consumption.
How to Identify Affected Products
Consumers can identify products subject to the recall by checking the packaging for the Maryland plant permit number 24-128. The recalled cheese was sold under several brand names at various retail locations, primarily in Maryland, Virginia, North Carolina, New York, New Jersey, and Washington, D.C. The CDC advises that even if a product does not show signs of spoilage, it should be discarded immediately. Retailers have been instructed to remove all Clover Hill Dairy inventory from shelves, but consumers should check their refrigerators for any remaining stock, regardless of the printed sell-by date.
Understanding Listeria Risks
Listeria monocytogenes is a hardy bacterium that can survive and grow in refrigerated environments. According to the Mayo Clinic, infection is particularly dangerous for high-risk groups, including adults over 65, pregnant women, and individuals with weakened immune systems.
- Pregnant Women: The infection can lead to miscarriage, stillbirth, or premature delivery.
- Immunocompromised Individuals: Symptoms may progress to meningitis or severe blood infections.
- General Population: Healthy adults may experience fever, muscle aches, and gastrointestinal distress, though severe cases can be fatal.
The Role of Whole Genome Sequencing
The connection between these illnesses, which spanned from March 2023 to May 2024, was only made possible through whole genome sequencing. This technology allows investigators to compare the DNA fingerprints of bacteria found in patients with those found in food or production facilities. In this instance, the three-year window between the earliest case and the final recall highlights the difficulty of identifying outbreaks caused by sporadic, low-volume consumption of contaminated products. Unlike large-scale outbreaks associated with a single major food item, these cases were geographically dispersed, making the genomic link the primary tool for identifying the source.
Key Facts About the Outbreak
- Total Cases: 9 confirmed illnesses.
- Hospitalizations: 8 individuals.
- Deaths: 1 reported.
- Affected Brands: De Mi Pueblo, Quesos La Ricura, Izalco, Kesso, and Rio Lindo.
- Facility Identifier: Maryland plant permit number 24-128.
As of late June 2024, the FDA and CDC continue to monitor the situation. The facility remains under regulatory scrutiny, and production is suspended until the company can demonstrate that the environmental contamination has been fully remediated and that its cleaning protocols meet federal safety standards.
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