Key words: Listeria monocytogenes, poultry, processing plant, evisceration. ABSTRACT . Listeria antisera (Denka Seiken, Tokyo, Japan), accord- ing to the . Caracterização feno e genotípica de cepas de Listeria monocytogenes isoladas They were also serotyped (Denka Seiken, Japan), and sub–typed by PFGE. Antisera for the typing of Listeria Group O and H antigens. Aids public health and food testing laboratories in identifying sources of infection/contamination to.

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National Center for Biotechnology InformationU. In this study, these two drugs were tested individually and none of the strains showed resistance to trimethoprim. Picking one or a small number of colonies following an enrichment protocol for serotyping may therefore not include all serotypes present in the original sample. Note that serotype 4e is indistinguishable from 4b in this case. All subsequent steps were performed at room temperature. Considering the lisferia of information available in Seijen concerning listeriosis, the aim of this study was to analyze phenotypic and genotypically the L.

Using a well enzyme-linked immunosorbent assay ELISA format instead of agglutination as a means to score reactions with each antiserum, this method provides a semiquantitative measurement of positive and negative reactions and requires only a fraction of the antisera used in the agglutination assay. From January to May13 isolates from clinical materials seven from cerebrospinal fluid, five from blood and one from a liquid collected from an aorta prosthesis of 12 patients 11 adults and one newborn were identified as L.

The antimicrobial susceptibility of the isolates was evaluated by the microdilution broth method for lizteria, gentamicin, trimethoprim, sulfamethoxazole and vancomycin. Influence of environmental conditions on the expression of virulence factors by Listeria monocytogenes and their use in species identification. During testing, two strains FSL-J and G seikeb nonmotile on motility agar, listdria a third strain FSL-J was delayed in motility, requiring a second passage on motility agar.


Species and serovars of the genus Listeria isolated from different sources in Brazil from to Wild birds and silage as reservoirs of Listeria in the agricultural environment.

Typing of Listeria monocytogenes strains by repetitive element sequence-based PCR. Current methods to subtype L.

How to cite this article. After color development, alkaline phosphatase was inactivated seiiken incubating the filters for 10 min in 50 mM EDTA, pH 8. Comparison of ribotyping, arbitrarily primed PCR, and pulsed-field gel electrophoresis for molecular typing of Listeria monocytogenes.

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Average values of duplicate reactions of each strain for each O-factor antiserum and H-factor antiserum were calculated relative to the maximum O-factor antiserum and H-factor antiserum reactions, respectively, for that strain.

Acknowledgments We thank C.

Traditional epidemiological surveillance alone may not detect many common source outbreaks, particularly if a limited number of cases occur over a wide geographic area, due to the unique characteristics of human foodborne listeriosis. While very rarely mentioned in the literature until recently, few cases of listeriosis have been reported in previously healthy persons and such cases were attributed to exposure to high infective doses, as well as outbreaks of benign febrile gastroenteritis 2,8, The discrepancy was investigated by developing a serogroup-specific colony immunoblot method, which could distinguish these serogroups by differential staining Fig.

Prior to serotype determination, single colonies of each strain were inoculated onto brain heart infusion BHI Difco motility plates containing 0.

Serotyping was performed by a slide agglutination assay using commercially prepared antisera Listeria antiserum Seiken kit; Denka Seiken Co.


Epidemiology of human listfria and seafoods. Muraoka for technical assistance; and J. Wells were washed twice with wash buffer 0. The use of a commercially prepared set of antisera and a semiquantitative ELISA format greatly reduce the variability of antiserum quality as well as the inconsistencies in judgement associated with weakly agglutinating antigen-antiserum combinations.

An outbreak of febrile gastroenteritis associated with corn contaminated by Listeria monocytogenes. These strains were isolated from various sources, including produce, meats and dairy products, food processing environments, animals and humans, soils, and environmental samples. Finally, it is known that the cases documented here may not represent the true incidence in the community, especially with regard to perinatal infection, once many laboratories of the region covered by this study do not often send the isolates for further characterization by the Regional Lab.

In order to help filling this gap, collecting some data from Brazil was one of the aims of this research. Subtyping methods will only provide their full listeriia health benefit if food histories were routinely obtained for all listeriosis patients to provide an epidemiological support for putative single genotype clusters.

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Surto de meningite neonatal por Listeria monocytogenes. Incidence of antibiotic resistance in Listeria species. Nenhuma das cepas foi resistente aos antimicrobianos testados; entretanto, sete tiveram valores da CIM aumentados para o sulfametoxazol. Serotyping of Listeria monocytogenes and related species.