Listeria spp

Nobmann P, Smith A, Dunne J, Henehan G and Bourke P. 2009. The antimicrobial efficacy and structure activity relationship of novel carbohydrate fatty acid derivatives against Listeria spp. and food spoilage microorganisms. Int J Food Microbiol 128(3) 440—445. 

The recovery of antibiotic-resistant Salmonella spp. and Listeria spp. from drinking water is also reported [35, 143, 144]. 

Kutter, S., Hartmann, A., and Schmid, M. (2006). Colonization of barley (Hordeum vulgare) with Salmonella enterica and Listeria spp. FEMS Microbiol. Ecol. 56, 262-271. 

Rodrigues, M., Capell, C. J., and Kirby, R. M. (1995). A new capacitance medium for presumptive detection of Listeria spp. from cheese samples. /. Microbiol. Methods 23,291-296. 

Samelis, J. and Metaxopoulos, J. 1999. Incidence and principle sources of Listeria spp. and Listeria monocytogenes contamination in processed meats and a meat processing plant. Food Microbiology 16 465 77. 

Hayman et al. (2004) demonstrated that high-pressure processing (600 MPa, 20°C, 3 min) could extend the refrigerated shelf life of ready-to-eat meats and reduce L. monocytogenes by more than 4-log CFU/g. Besides, counts of aerobic and anaerobic mesophiles, lactic acid bacteria. Listeria spp.. Staphylococci, Brochothrix thermosphacta, conforms, and fungi were also undetectable when stored at 4°C for 98 days. Moreover, consumer acceptability and sensory quality of the product was found to be very high. 

Listeria spp. is probably one of the most seriously treated food-borne pathogens due to its ability to cause listeriosis, a condition with flu-like symptoms which can compromise the human immune system especially in pregnant women, children and the elderly. Mortality rates from full listeriosis are at 20% prompting the USDA and FDA to set a "zero tolerance" against the pathogen. Detection of this microbe is therefore more important than enumeration. In food. Listeria spp. can grow even at refrigerated temperatures and have been isolated from meat and cheese products. 

Vancomycin-resistant enterococci (VRE) often contaminate the hospital environment. QACs were found to be highly effective against eight strains of VRE, using a quantitative suspension test method [30]. They are also effective against Listeria spp. [31]. 

CA Genigeorgis, D Dutulescu, JE Garayzabal. Prevalence of Listeria spp. in poultry meat at the supermarket and slaughterhouse level. J Pood Prot 52(9) 618-624, 1989. 

The ability of immobilized lectin-magnetic separation to improve methods for the detection of Staphylococcus aureus. Salmonella enteritidis and Listeria monocytogenes was reported [161]. A new assay, called Lister Screen method, was developed to detect Listeria spp. in food [162]. This method separates Listeria cells from enriched food samples by means of immunomagnetic beads. After magnetic capture, the beads are spread on PALCAM agar. The analysis time, including an 18-h enrichment and plate incubation, is 48 h for positive samples and 72 h for negative samples. 

ELISAs can be used in two modes, qualitatively to determine the presence or absence, or quantitatively to determine the amount of antigen present. ELISA kits often depend on the adsorption of either the antibody or antigen to a solid phase, e.g., wells of a microtiter plate, surface of plastic beads, or plastic stick. The choice of antibody (or antibodies) used determines the specificity of the ELISA assay, which can range from genus-specific to strain-specific. The principle on which ELISA methods are based usually prevents them from being used for the determination of total microbial counts. However, they can be used to detect pathogens such as Salmonella spp.. Listeria spp. 

Anton test A test of virulence, especially for Listeria spp., 10 cells are placed in the eye of a guinea pig or rabbit and conjunctivitis is observed... 

MALDI-TOF MS identification has also been reported [58], Such applications substituting the additional growth on agar plates accelerate the detection of particular microorganisms. They could also be envisioned for other samples and bacteria, for example. Streptococcus agalactiae from vaginal swabs or Listeria spp. and Campylobacter spp. from food samples. 

Eugenol and trans-cinnamaldehyde Emulsion evaporation Active against Listeria spp. and Salmonella spp. 74... 

About 2% oxygen remains in the pouch even with vacuum packaging. This will be utilised by any aerobic microorganisms present until it is exhausted. After it is exhausted, only facultative anaerobes such as Salmonella, Yersinia, Staphylococcus and Listeria spp. and strict anaerobes such as Clostridium botulinum and Clostridium perfringens can grow. 

Zhao, T., Podtburg, T.C., Zhao, R, et al. (2006) Control of Listeria spp. by competitive-exclusion bacteria in floor drains of a poultry processing plant. Appl Environ Microbiol 72, 3314—3320. 

---