Listeria monocytogenes, a bacterium that has become a well-known cause of foodborne illness such as listeriosis causing significant challenges to public health worldwide. This article aims to explain about Listeria and its impact on health, recent outbreaks, and essential safety and prevention tips.
Listeria monocytogenes is a gram-positive bacteria that can cause severe infection when consumed through contaminated foods. The bacterium thrives in cold environments which is why it’s often associated with refrigerated foods and transmitted to humans through the consumption of contaminated food products such as dairy products, processed meats, and certain types of fresh produce.
Recent Listeria Outbreaks
Recent years have seen several outbreaks of listeriosis, the infection caused by Listeria monocytogenes, leading to increased concern among public health officials.
A recent outbreak of listeriosis in the USA has been reported and it is linked to Queso Fresco and Cotija cheese products produced by Rizo-López Foods, Inc. Following the detection of Listeria in their aged cotija cheese by Hawaii state officials the company initiated a recall of all cheese and dairy products from their facility and halted production temporarily to prevent the spread of infections.
Symptoms of Listeria Infection
Listeriosis can manifest through various symptoms depending on the individual’s immune system and the severity of the infection. Common signs include
- Fever
- Nausea
- Diarrhea and
- Muscle aches
If the infection spreads further the symptoms can lead to
- Headache
- Stiff neck
- Loss of balance
- Confusion
- Convulsions
Pregnant women may experience mild flu-like symptoms but the infection might cause complications for the fetus or newborn sometimes causing miscarriages.
Prevention
Preventing listeriosis involves following strict hygiene practices and being conscious of the food you consume. Here are some preventive measures
- Wash your hands and kitchen surfaces: Regular handwashing and cleaning of kitchen surfaces can significantly reduce the risk of contamination.
- Cook meat thoroughly: Listeria is killed by cooking so ensure that meat is cooked to high internal temperatures to be safe.
- Avoid high-risk foods: Pregnant women and those with weakened immune systems should avoid unpasteurized dairy products, ready-to-eat meats, and smoked seafood.
- Store food correctly: Keep your refrigerator below 4°C and your freezer below -18°C to inhibit Listeria growth.
Microbial testing plays a crucial role in the prevention and management of listeria outbreaks safeguarding public health by ensuring food safety and the effectiveness of disinfectants and packaging materials. These testing protocols are fundamental in detecting the presence of Listeria monocytogenes enabling early detection and preventing the spread of this potentially dangerous bacterium.
The Role of Microbial Testing Services
Microbial testing helps identify and quantify the presence of harmful microorganisms in food, surfaces, and products. For Listeria monocytogenes timely detection through these tests is critical as it allows for the immediate recall of contaminated products preventing the bacterium from infecting consumers and reducing the risk of outbreaks. Moreover testing packaging materials and disinfectants ensures they are effective against Listeria further minimizing the chances of contamination and spread.
Standard Testing Protocols for Products
Several standard testing protocols have been established to analyse the presence of Listeria monocytogenes and ensure the efficacy of materials and products in controlling or eliminating this pathogen. These include:
- ISO 11290: This standard specifies methods for detecting Listeria monocytogenes and other microorganisms in food and animal feed. It is widely used in the food industry to ensure that products are safe for consumption.
- ISO 22196: This method evaluates the antibacterial activity on plastics and non-porous surfaces. It’s important to ensure that packaging materials do not support the growth of Listeria.
- EN 13697: This European Standard provides a test method for analyzing the bactericidal or fungicidal activity of chemical disinfectant products.
- ISO 16140: This standard provides guidelines for the validation of methods for the detection of foodborne pathogens including Listeria.
Additional Relevant Protocols
Other protocols may also be relevant depending on the specific context and requirements include
- ISO 20743: This method determines the antibacterial activity of textile products offering insights into how materials might inhibit the growth of bacteria like Listeria on surfaces.
- ISO 22000: ISO 22000 outlines requirements for a food safety management system including measures to prevent microbial contamination.
To minimize the risk of listeriosis, Microbial testing services play a vital role in identifying the presence of Listeria monocytogenes in food product packaging materials and disinfectants. These testing protocols are essential for identifying potential contamination in food products and preventing listeriosis outbreaks.
The Role of Microbial Investigations Switzerland (MIS)
Microbial Investigations Switzerland (MIS) plays a crucial role in fighting outbreaks of Listeria monocytogenes by providing comprehensive microbial testing and analysis services. By accurately identifying Listeria in food products and environments using advanced methodologies, MIS enables early detection and prevention measures. It also provides expert consultancy on risk management and validates the efficacy of sanitation protocols and offers consultation to enhance food safety practices. Additionally, MIS supports public health initiatives by collaborating with authorities and contributing to surveillance and research efforts playing a critical role in safeguarding public health and ensuring food safety.
Microbe Investigations Switzerland (MIS) excels in determining the antimicrobial efficiency of products claiming microbial protection such as textiles, disinfectants, plastics, and coating solutions.
We are committed to delivering high-quality testing services that meet and exceed our client’s expectations. Alongside our commitment to providing excellent testing services, we place a strong emphasis on enhancing customer satisfaction through cost-effective solutions and quick service delivery.
To submit a test request or to learn more about our microbial testing services, please contact us.
