Related Experiment Video
Updated: Jan 25, 2026
05:02
Listeria monocytogenes Infection of the Brain
Published on: October 2, 2018
13.2K
Listeria monocytogenes in Fish Products
1Microbiology Research Division, Bureau of Microbial Hazards, Food Directorate, Health and Welfare Canada, Ottawa, Ontario K1A 0L2.
Journal of Food Protection
|May 11, 2019
Summary
Ready-to-eat seafood like shrimp and smoked salmon can be contaminated with Listeria monocytogenes. However, this bacterium grows slowly on fish products, posing minimal risk unless temperature abuse occurs.
Area of Science:
- Food safety
- Microbiology
- Seafood science
Background:
- Ready-to-eat (RTE) fish products are susceptible to microbial contamination.
- Listeria monocytogenes is a significant foodborne pathogen.
- Contamination of RTE seafood poses a public health concern.
Purpose of the Study:
- To assess the prevalence and growth of Listeria monocytogenes in RTE fish products.
- To determine the risk associated with Listeria monocytogenes in seafood.
Main Methods:
- Sampling of fish products at wholesale and retail levels.
- Artificial inoculation of cooked seafood with Listeria monocytogenes.
- Incubation of inoculated seafood at 4°C to observe bacterial growth.
Main Results:
- Listeria monocytogenes was detected in RTE fish products, including shrimp and smoked salmon.
- The organism grew on cooked crabmeat, lobster, shrimp, and smoked salmon at 4°C.
- Bacterial growth was more pronounced on crab and lobster compared to shrimp and salmon.
- Slow multiplication of Listeria monocytogenes was observed on naturally contaminated shrimp.
Conclusions:
- While Listeria monocytogenes can contaminate RTE fish, its growth is limited under recommended storage conditions.
- The risk of listeriosis from contaminated fish is low due to low contamination levels and short shelf life.
- Proper temperature control is crucial to prevent potential health hazards from Listeria-contaminated fish products.
Related Concept Videos
02:32Osmoregulation in Fishes
53.0K
When cells are placed in a hypotonic (low-salt) fluid, they can swell and burst. Meanwhile, cells in a hypertonic solution—with a higher salt concentration—can shrivel and die. How do fish cells avoid these gruesome fates in hypotonic freshwater or hypertonic seawater environments?
53.0K
02:07FISH - Fluorescent In-situ Hybridization
24.1K
Fluorescence in situ hybridization, or FISH, was developed in the early 1980s and has quickly become one of the most widely used techniques in cytogenetics. Labeled probes are used to bind complementary DNA or RNA sequences on a chromosome or in a region within a cell. Earlier, the probes could only be obtained by cloning or reverse transcription of a DNA template. Currently, the probe oligonucleotides can be synthesized synthetically. Additionally, with the advancement of optical techniques,...
24.1K
01:11Scalar Product (Dot Product)
26.4K
The scalar multiplication of two vectors is known as the scalar or dot product. As the name indicates, the scalar product of two vectors results in a number, that is, a scalar quantity. Scalar products are used to define work and energy relations. For example, the work that a force (a vector) performs on an object while causing its displacement (a vector) is defined as a scalar product of the force vector with the displacement vector.
The scalar product of two vectors is obtained by multiplying...
The scalar product of two vectors is obtained by multiplying...
26.4K
01:17Vector Product (Cross Product)
27.7K
Vector multiplication of two vectors yields a vector product, with the magnitude equal to the product of the individual vectors multiplied by the sine of the angle between both the vectors and the direction perpendicular to both the individual vectors. As there are always two directions perpendicular to a given plane, one on each side, the direction of the vector product is governed by the right-hand thumb rule.
Consider the cross product of two vectors. Imagine rotating the first vector about...
Consider the cross product of two vectors. Imagine rotating the first vector about...
27.7K
01:21Wood Products
299
Wood products encompass a broad range of materials crafted from wood strands, veneers, lumber, and even waste wood-like shreds, designed for both structural and nonstructural purposes. Various specialized wood products have been developed to enhance strength, durability, and versatility in building applications.
Glue-laminated wood, often referred to as glulam, combines multiple smaller pieces of dimensional lumber using adhesives to form a single, larger piece. Cross-laminated timber consists...
Glue-laminated wood, often referred to as glulam, combines multiple smaller pieces of dimensional lumber using adhesives to form a single, larger piece. Cross-laminated timber consists...
299
01:29Dot Product
926
The dot product is an essential concept in mathematics and physics.
In engineering, the dot product of any two vectors is the product of the magnitudes of the vectors and the cosine of the angle between them. It is denoted by a dot symbol between the two vectors.
Consider a vehicle pulling an object along the ground using a rope. If the rope makes an angle with the horizontal axis, the work done can be calculated using the dot product of the force applied and the object's displacement.
The dot...
In engineering, the dot product of any two vectors is the product of the magnitudes of the vectors and the cosine of the angle between them. It is denoted by a dot symbol between the two vectors.
Consider a vehicle pulling an object along the ground using a rope. If the rope makes an angle with the horizontal axis, the work done can be calculated using the dot product of the force applied and the object's displacement.
The dot...
926