What is the morphology of Listeria monocytogenes?

Listeria monocytogenes is a Gram-positive rod-shaped bacterium. It is the agent of listeriosis, a serious infection caused by eating food contaminated with the bacteria.

How many strains of Listeria monocytogenes are there?

The genus Listeria currently includes 17 recognized species (Listeria monocytogenes, Listeria seeligeri, Listeria ivanovii, Listeria welshimeri, Listeria marthii, Listeria innocua, Listeria grayi, Listeria fleischmannii, Listeria floridensis, Listeria aquatica, Listeria newyorkensis, Listeria cornellensis, Listeria …

What is the description of the motility of Listeria monocytogenes?

monocytogenes is actively motile by means of peritrichous flagella at room temperature (20−25 °C), the organism does not synthesize flagella at body temperatures (37 °C). The genus Listeria belongs to the class Bacilli and the order Bacillales, which also includes Bacillus and Staphylococcus.

How do you confirm Listeria monocytogenes?

Listeriosis is usually diagnosed when a bacterial culture (a type of laboratory test) grows Listeria monocytogenes from a body tissue or fluid, such as blood, spinal fluid, or the placenta. Listeriosis is treated with antibiotics.

Is listeria killed by alcohol?

When cells from spleens, a key immune organ, were extracted from mice and treated with ethanol, they had significantly lower levels of killing Listeria monocytogenes and Borrelia burgdorferi (Pavia et. al.).

What makes Listeria unique from other bacteria?

Listeria monocytogenes. L. monocytogenes is one of the most virulent food-borne pathogens. It can flourish with or without oxygen and, unlike many other bacteria, can thrive and reproduce at temperatures as low as 0°C.

Are there any new species of Listeria monocytogenes?

In recent years, many new species were proposed. However, these new species are not widely adopted and the number of type strains for the newly proposed species are very limited. L. ivanovii and L. monocytogenes are pathogenic for mice and other animals. However, only L. monocytogenes is commonly associated with human listeriosis.

How to detect Listeria monocytogenes ( Bam ) Chapter 10?

A 50 g portion of this composite blend (equivalent to 25g food plus 25 ml basal BLEB) is combined with 200 ml of basal BLEB. The composite is then inoculated as described in section E or F. An aliquot (100 ml) of the composite blend should be retained, preferably at 5° C and not below 0° C, for possible pathogen enumeration.

When was PCR confirmation for Listeria monocytogenes?

November 2011: Addition of PCR confirmation for Listeria monocytogenes and Listeria spp. isolates other than L. grayi. April 2011: Section E. Diagram describing the Henry Optical System for examination of colonies added; references for Listeria monocytogenes Risk Assessment and Guidance updated.

How many species of Listeria are there in the world?

April 2001: Section H. CAMP test: Updated address for ATCC and added a link to its web page. The genus Listeria contains 6 species: L. monocytogenes, L. innocua, L. seeligeri, L. welshimeri, L. ivanovii, and L. grayi (Table 1).