Toronto, Canada — A recent outbreak of Listeria in Canada linked to several popular plant-based milk brands has led to two deaths and a number of hospitalizations, sparking concerns over the safety of what many consider healthier dairy alternatives. The Public Health Agency of Canada has confirmed a dozen cases of the infection, predominantly among older adults, with incidents reported predominantly in Ontario, but also in Quebec and Nova Scotia.
The outbreak, first identified between August 2023 and early July 2024, involves products including almond, oat, coconut, and cashew milks under the Silk and Great Value labels. Following the revelation, the Canadian Food Inspection Agency (CFIA) enforced a recall of 18 different plant-based beverages, affecting items with expiration dates ranging up to October 4, 2024.
Listeria monocytogenes, the bacteria responsible for the condition, typically finds its origins in soil but can turn lethal when it contaminates food products. Symptoms of listeriosis, the infection caused by the bacteria, include fever, stomach issues, and muscle aches, posing significant risks, particularly to vulnerable populations. The bacterium is notable for its ability to multiply even in refrigerated conditions, where most other pathogens do not thrive, highlighting the importance of stringent food safety measures.
Dr. Lori Burrows, a professor at McMaster University, expressed her surprise at the connection of plant-based milks to a listeria outbreak, noting that such products are generally perceived as a safer alternative to dairy. Lawrence Goodridge, director of the Canadian Research Institute for Food Safety, speculated that the contamination might have arisen during the processing phase, possibly due to lapses in the heat treatment process or during packaging.
The health officials have underscored the challenges related to the outbreak, primarily due to the extended incubation period of Listeria, which can delay symptom onset for up to two months. This prolongation complicates efforts to trace and control the outbreak’s spread, potentially leading to a rise in cases as the investigation unfolds.
In response to the incident, health officials are emphasizing the importance of thorough cooking and pasteurization as effective measures against Listeria. They have also issued advisories for consumers to examine their pantries for affected products and either dispose of or return them immediately to ensure safety.
Adding to the concern, a renowned national Listeria attorney highlighted the risks associated with even perceived healthier food options. He cautioned that improper processing and handling could pose significant health threats, particularly to sensitive groups like pregnant women, advising them to avoid consumption of the recalled products promptly.
This outbreak serves as a critical reminder of the intricate balance required in food processing and the continuous need for rigorous safety protocols. Consumers are urged to remain vigilant about the food sources they trust and to adhere to recommended guidelines to prevent such health risks.