|
|
|
| Registros recuperados: 29 | |
|
|
| Paillard, Christine; Leroux, Frederique; Borrego, Juan. |
| The main microbial diseases affecting marine cultured bivalves have been revised on the basis of the etiologic agents, pathogenesis and pathogenicity. Several recent bivalve-interaction models have been studied, including Pecten larvae-Vibrio pectinicida, brown ring disease, juvenile oyster disease, Pacific oyster nocardiosis and summer mortalities of oysters. In addition, the taxonomy and phylogeny of new potential bivalve pathogens and their virulence factors have been established. Facing the difficulty of identifying bacterial strains associated with molluscan diseases (mainly vibriosis), polyphasic approaches have been developed to correlate the phenotype and genotype of potential pathogens. By evaluating likely virulence mechanisms, developing... |
| Tipo: Text |
Palavras-chave: Diagnostic tools; Virulence factors; Pathogenicity; Pathogenesis; Etiology; Bivalve mollusc; Vibriosis. |
| Ano: 2004 |
URL: http://archimer.ifremer.fr/doc/2004/publication-407.pdf |
| |
|
|
| Perez-pascual, David; Lunazzi, Aurelie; Magdelenat, Ghislaine; Rouy, Zoe; Roulet, Alain; Lopez-roques, Celine; Larocque, Robert; Barbeyron, Tristan; Gobet, Angelique; Michel, Gurvan; Bernardet, Jean-francois; Duchaud, Eric. |
| Tenacibaculum maritimum is a devastating bacterial pathogen of wild and farmed marine fish with a broad host range and a worldwide distribution. We report here the complete genome sequence of the T. maritimum type strain NCIMB 2154(T). The genome consists of a 3,435,971-base pair circular chromosome with 2,866 predicted protein-coding genes. Genes encoding the biosynthesis of exopolysaccharides, the type IX secretion system, iron uptake systems, adhesins, hemolysins, proteases, and glycoside hydrolases were identified. They are likely involved in the virulence process including immune escape, invasion, colonization, destruction of host tissues, and nutrient scavenging. Among the predicted virulence factors, type IX secretion-mediated and cell-surface... |
| Tipo: Text |
Palavras-chave: Tenacibaculum maritimum; Fish pathogen; Virulence factors; Genome; Toxins. |
| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00488/59939/63150.pdf |
| |
|
| |
|
|
| Oliveira,ES; Cardozo,MV; Borzi,MM; Borges,CA; Guastalli,EAL; Ávila,FA. |
| ABSTRACT Avian pathogenic Escherichiacoli (APEC) virulence mechanism has been continuously studied and it is believed to be multifactorial and because of this, this work aimed to characterize potentially APEC strains isolated from free-range hens. Isolates were submitted to PCR for the detection of virulence genes, which were of high prevalence. In vivo inoculation of day-old chicks revealed that 49 of these strains were of high and intermediate pathogenicity. In addition, isolates were submitted to antimicrobials susceptibility test with the majority of the strains presenting multiresistance. Phylogenetic analysis showed a greater presence of potentially APEC isolates in-group B2. In addition, high heterogeneity was detected among the isolates byXbaI... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: APEC; Backyard chickens; Colibacillosis; Pathogenicity; Virulence factors. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2019000100326 |
| |
|
|
| Rall,Vera Lúcia Mores; Iaria,Sebastião Timo; Heidtmann,Sandra; Pimenta,Fabiana Cristina; Gamba,Rosa Carvalho; Pedroso,Débora Midori Myaki. |
| Aeromonas has been described as an emergent foodborne pathogen of increasing importance. In this study, we report that 48% of 50 Pintado fish samples collected at the retail market of São Paulo city were positive for Aeromonas sp, as detected by the direct plating method. When the presence/absence method was used, the positivity was 42%. A. caviae was the most frequent species, followed by A. hydrophila and A. sobria. Production of cytotoxic enterotoxin, observed in suckling mouse assay, was detected in 67% of A. sobria strains, in 60% of A. hydrophila strains and in 40% of A. caviae strains. In vitro tests, performed with HEp-2 cells, showed that 88% of A. hydrophila, 27% of A. sobria and 13% of A. caviae strains were positive for this toxin. The in vivo... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aeromonas sp; Virulence factors; Drug susceptibility; Fish. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37141998000300015 |
| |
|
| |
|
|
| Resende,D.; Santo,E.; Macedo,C.; Marin,J.M.. |
| The prevalence of virulence genes expressing fimbriae, production of hemolysin, colicin and aerobactin, was determined in Escherichia coli isolates from healthy cows genital tract not showing clinical signs of infection. The presence of fimbriae expression genes (pap, sfa, afa) was assayed using specific primers in a polymerase chain reaction; none were detected in any of the isolates. Yet, a prevalence of 90.4%, 69.8%, and 28.5% of virulence factors for colicin, hemolysin and aerobactin respectively, was detected in the isolates. Analysis of the bacterial pathogenicity of isolates from the bovine genital tract may contribute towards the understanding of E. coli behavior. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cow; Escherichia coli; Genital tract; Virulence factors. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352007000300003 |
| |
|
|
| Rocha,Antônio José; Barsottini,Mario Ramos de Oliveira; Rocha,Renan Rhonalty; Laurindo,Maria Vitória; Moraes,Francisco Leandro Laurindo de; Rocha,Soraya Lília da. |
| Abstract In this review, we explore some aspects of Pseudomonas aeruginosa virulence factors that are related to disease development in healthy organisms and resistance to antibiotics. This pathogen is one of the most clinically and epidemiologically important bacteria in Brazil, being the major cause of opportunistic infections. Among the virulence factors, biofilm formation acting of manner different in the organism. Furthermore, we review several P. aeruginosa genes that act in antimicrobial resistance, such as β-lactamases against β-lactamers. The resistance to pied-lactamases in P. aeruginosa is associated to resistance to the broad-spectrum cephalosporin. On the other hand, there is a group of synthetic broad-spectrum antibiotics acting on DNA... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pseudomonas aeruginosa; Virulence factors; Antimicrobial activities; Biofilms; Β-lactamase. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132019000100902 |
| |
|
|
| Foysal,Md Javed; Majlish,Al-Nahian Khan; Islam,Kamrul; Alam,Md Jahangir; Ali,Md Hazrat; Momtaz,Farhana. |
| ABSTRACT Studies were conducted to characterize Klebsiella pneumoniae isolates from urinary tract infection (UTI) patients in Sylhet city of Bangladesh. At the same time, all isolates were screened for some common virulence genes and four significant isolates were searched for plasmid number and sizes by mini alkaline-lysis method. Among five tested isolates from female UTI patients, gyrase subunit B2 (gyrb2) amplified in all isolates, lipase and nuclease detected in three isolates and serine protease amplifies in two isolates and gave the expected band of 1130 bp, 517 bp, 1055 bp and 211 bp respectively. Two of four isolates showed 9.82 kb plasmid band on agarose gel. Isolates bearing 9.82 kb plasmid were found to be resistant to multiple commercial... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: K. pneumoniae; Urinary tract infection; Virulence factors; Plasmid profiling; Correlation study. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132018000100423 |
| |
|
|
| Ludovico,Marilucia Santos; Martins,Luciano Moura; Bianco,Juares Ednaldo Romero; Andrade,Célia Guadalupe Tardelli de Jesus; Falcon,Rosabel; Joazeiro,Paulo Pinto; Gatti,Maria Silvia Viccari; Yano,Tomomasa. |
| ABSTRACT Plesiomonas shigelloides isolated from water in Brazil was previously described as a hemorrhagic heat-labile cytotoxic-enterotoxin producer. We purified this toxin from culture supernatants using ion metallic affinity chromatography (IMAC) followed by molecular exclusion chromatography. The pure toxin presented molecular mass of 50 kDa and isoelectric point (pI) around 6.9 by 2D electrophoresis. When injected intravenously, the purified cytotoxic-enterotoxin induced also severe spasms followed by sudden death of mice. Hence, we entitled it as lethal cytotoxic-enterotoxin (LCE). The presence of membrane vesicles (MVs) on cell surfaces of P. shigelloides was observed by scan electron microscopy (SEM). From these MVs the LCE toxin was extracted and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lethal cytotoxic enterotoxin (LCE); Membrane vesicles (MVs); Plesiomonas shigelloides; Toxin transportation; Virulence factors. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702016000600546 |
| |
|
|
| Oliveira,Pollianna S.; Souza,Simone G.; Campos,Guilherme B.; Silva,Danilo C.C. da; Sousa,Daniel S.; Araújo,Suerda P.F.; Ferreira,Laiziane P.; Santos,Verena M.; Amorim,Aline T.; Santos,Angelita M.O.G.; Timenetsky,Jorge; Cruz,Mariluze P.; Yatsuda,Regiane; Marques,Lucas M.. |
| Currently, hospital infection is a serious public health problem, and several factors may influence the occurrence of these infections, including the presence of insects, which are carriers of multidrug-resistant bacterial species. The aim of this study was to isolate staphylococci carried by insects in two public hospitals of Vitoria da Conquista, Bahia and to identify the resistance profile, pathogenicity and efficacy of disinfection of the premises. A total of 91 insects were collected in 21 strategic points of these hospitals, and 32 isolated strains ofStaphylococcus aureus were isolated. Based on antibiogram and Minimum Inhibitory Concentration results, 95% of these strains were susceptible to oxacillin. These strains were also evaluated for the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Insects; Staphylococcus aureus; Resistance; Virulence factors; Disinfection. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702014000200129 |
| |
|
|
| Carbonell,G.V.; Amorim,C.R.N.; Furumura,M.T.; Darini,A.L.C.; Fonseca,B.A.L.; Yano,T.. |
| Serratia marcescens cytotoxin was purified to homogeneity by ion-exchange chromatography on a DEAE Sepharose Fast Flow column, followed by gel filtration chromatography on a Sephadex G100 column. The molecular mass of the cytotoxin was estimated to be about 50 kDa. Some biological properties of the cytotoxin were analyzed and compared with well-characterized toxins, such as VT1, VT2 and CNF from Escherichia coli and hemolysin produced by S. marcescens. The sensitivity of the cell lines CHO, HeLa, HEp-2, Vero, BHK-21, MA 104 and J774 to the cytotoxin was determined by the cell viability assay using neutral red. CHO and HEp-2 were highly sensitive, with massive cellular death after 1 h of treatment, followed by BHK-21, HeLa, Vero and J774 cells, while MA 104... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cell culture; Biological activity; Serratia marcescens; Cytotoxin; Virulence factors. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003000300010 |
| |
|
|
| Kerbauy,G.; Perugini,M.R.E.; Yamauchi,L.M.; Yamada-Ogatta,S.F.. |
| In this study, we report the characterization of a strain of Enterococcus faecium vanA, which grows only in the presence of vancomycin (VDEfm-UEL). The bacterium was isolated from the feces of a female patient who had undergone surgical treatment of Reinke’s edema and was receiving intravenous vancomycin therapy for infection with methicillin/oxacillin-resistant Staphylococcus aureus, a postoperative complication. Antimicrobial dependence was further confirmed by the vancomycin E-test. VDEfm-UEL was also shown to be resistant to ampicillin, ciprofloxacin, chloramphenicol, erythromycin, levofloxacin, penicillin, rifampicin, and teicoplanin. The putative virulence genes efaA, gelE and esp were detected by PCR. The ddl gene from VDEfm-UEL was cloned and... |
| Tipo: Info:eu-repo/semantics/report |
Palavras-chave: Enterococcus faecium; Vancomycin; Dependence; VanA genotype; Virulence factors. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2011000300013 |
| |
|
|
| Santos,A.C.M.; Zidko,A.C.M.; Pignatari,A.C.; Silva,R.M.. |
| Most of the knowledge of the virulence determinants of extraintestinal pathogenicEscherichia coli (ExPEC) comes from studies with human strains causing urinary tract infections and neonatal meningitis and animal strains causing avian colibacillosis. In this research, we analyzed the phylogenetic background, the presence of 20 ExPEC virulence factors, and the intrinsic virulence potential of 74 E. coli strains isolated in São Paulo, Brazil, from 74 hospitalized patients (43 males and 31 females) with unknown-source bacteremia. Unlike other places in the world, the bacteremic strains originated equally from phylogroups B2 (35%) and D (30%). A great variability in the profiles of virulence factors was noted in this survey. Nevertheless, 61% of the strains... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bacteremia; Extraintestinal pathogenic Escherichia coli; Virulence factors; Intrinsic virulence potential; Phylogenetic background. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2013001100968 |
| |
|
|
| Carbonell,G.V.; Alfieri,A.F.; Alfieri,A.A.; Vidotto,M.C.; Levy,C.E.; Darini,A.L.C.; Yanaguita,R.M.. |
| Cytotoxin production was studied in 60 Serratia marcescens strains isolated from hospitalized patients. Association of cytotoxic activity with serotype, source of isolation and presence of plasmids was also evaluated. Thirteen of the 60 S. marcescens strains produced a cytotoxic effect on Vero cells. These strains were isolated from distinct clinical sources and classified into seven different serotypes (O1:H7; O4:NM; O10:NT; O19:NM; O6,14:H4; O6,14:NM and O6,14:H1). No relationship was observed between cytotoxic activity and clinical source or serotypes of the strains. Plasmids from five cytotoxin-producing S. marcescens strains were transferred to E. coli K12/711. The transconjugants did not exhibit cytotoxicity, indicating that the cytotoxic effect is... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cytotoxin production; Nosocomial infections; Plasmids; Serratia marcescens; Virulence factors. |
| Ano: 1997 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1997001100005 |
| |
|
|
| Santos,Karina Maria Olbrich dos; Vieira,Antônio Diogo Silva; Salles,Hévila Oliveira; Oliveira,Jacqueline da Silva; Rocha,Cíntia Renata Costa; Borges,Maria de Fátima; Bruno,Laura Maria; Franco,Bernadette Dora Gombossy de Melo; Todorov,Svetoslav Dimitrov. |
| This study aimed to characterize the safety and technological properties of Enterococcus faecium strains isolated from Brazilian Coalho cheeses. High levels of co-aggregation were observed between Enterococcus faecium strains EM485 and EM925 and both Escherichia coli and Clostridium perfringens. Both strains presented low levels of hydrophobicity. E. faecium EM485 and EM925 were both able to grow in the presence of 0.5% of the sodium salts of taurocholic acid (TC), taurodeoxycholic acid (TDC), glycocholic acid (GC), and glycodeoxycholic acid (GDC), although they showed the ability to deconjugate only GDC and TDC. Both strains showed good survival when exposed to conditions simulating the gastro intestinal tract (GIT). When tested for the presence of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Enterococcus faecium; Probiotic properties; Technological properties; Virulence factors; Antibiotic resistance. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822015000100237 |
| |
|
|
| Todorov,Svetoslav Dimitrov; Stojanovski,Saso; Iliev,Ilia; Moncheva,Penka; Nero,Luis Augusto; Ivanova,Iskra Vitanova. |
| Abstract The present work discusses the technological and new selection criteria that should be included for selecting lactic acid bacteria for production of fermented meat. Lactic acid bacteria isolated from Bulgarian traditional fermented "lulanka" salami was studied regarding some positive technological parameters (growth at different temperature, pH, and proteolytic activity). The presence of genes related to the virulence factors, production of biogenic amines, and vancomycin resistance were presented in low frequency in the studied lactic acid bacteria. On the other hand, production of antimicrobial peptides and high spread of bacteriocin genes were broadly presented. Very strong activity against L. monocytogenes was detected in some of the studied... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lukanka; Antibiotic resistance; Virulence factors; Lactic acid bacteria; Bacteriocins. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822017000300576 |
| |
|
| |
|
|
| Furumura,Márcia T.; Figueiredo,Patricia M.S.; Carbonell,Gleize V.; Darini,Ana Lucia da Costa; Yano,Tomomasa. |
| Thirty-two clinical isolates of Enterococcus faecalis were screened for virulence factors. Twenty-four (75%) isolates produced hemolysin on Mueller-Hinton blood agar plates with sheep erythrocytes. However, the cell free heat-stable hemolysin was detected in all isolates (100%) of E. faecalis when grown in BHI-GA (BHI medium supplemented with 1% glucose and 0.03% L-arginine), but not in BHI broth alone. Twenty-four isolates (75%) produced caseinase and 23 (71.9%) lipase, but none of the isolates produced gelatinase. Fifteen (46.9%) culture filtrates caused rounding and membrane alterations with blebbing formation followed by death in HeLa and HEp-2 cells, but not in Vero cells. Thirteen isolates (40.6%) agglutinated rabbit erythrocytes, but did not produce... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Enterococcus faecalis; Virulence factors; Hemolysin; Proteases; Lipase; Cytotoxin; Biofilm. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822006000300007 |
| |
|
|
| Martins,Katheryne Benini; Faccioli-Martins,Patricia Yoshida; Riboli,Danilo Flávio Moraes; Pereira,Valéria Cataneli; Fernandes,Simone; Oliveira,Aline A.; Dantas,Ariane; Zafalon,Luiz Francisco; Cunha,Maria de Lourdes Ribeiro de Souza da. |
| The objective of this study was to characterize the clonal profile, virulence factors and antimicrobial resistance, particularly oxacillin resistance, of Staphylococcus aureus isolated from sheep milk. Milk samples were collected from all teats for the California Mastitis Test (CMT), somatic cell count, identification of S. aureus, investigation in these strains of genes encoding toxins (sea, seb, sec, sed, tst), biofilm (icaA, icaC, icaD, bap), leukocidin (luk-PV) oxacillin resistance by mecA gene detection and susceptibility testing (12 antibiotics). Messenger RNA expression was evaluated by RT-PCR in isolates carrying toxin and biofilm genes. Biofilm formation was also evaluated phenotypically by adherence to polystyrene plates. The clonal profile of S.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mastitis; Sheep; Staphylococcus aureus; Antibiotic resistance; Virulence factors. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822015000200535 |
| |
| Registros recuperados: 29 | |
|
|
|
