Consulta: subjectFacets:"Serotyping"
Registros recuperados: 17
Data/hora: 11/06/2024 01:00:02

Serotypes of Salmonella in Broiler Carcasses Marketed at Ibague, Colombia.
Provedor de dados: 89
Autores: Rodriguez,JM; Rondón,IS; Verjan,N.
ABSTRACT Salmonella enterica is a large group of Gram-negative bacteria responsible for a number of foodborne infections associated with the consumption of contaminated poultry products. The hygienic status of raw chicken meat marketed at Ibague, Tolima, Colombia, is currently unknown. To address this issue, a cross-sectional study was conducted to estimate the prevalence of Salmonella spp., in raw chicken marketed at different outlets in this city. Salmonella spp. was isolated by standard microbiological methods, followed by biochemical, serological, and molecular confirmation. Additionally, risk factors associated with the presence of the bacteria were identified. The prevalence of Salmonella in raw chicken was 17.41% (47/270), and 14 different serotypes...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Isolation; Poultry; Prevalence; Risk factors; Serotyping.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2015000400545

Altered indirect hemagglutination method for easy serotyping of Haemophilus parasuis
Provedor de dados: 45
Autores: Lorenson,M.S.; Miani,M.; Guizzo,J.A.; Barasoul,B.; Martínez-Martínez,S.; Rodríguez-Ferri,E.F.; Gutiérrez-Martín,C.B.; Kreutz,L.C.; Frandoloso,R.
ABSTRACT Glässer's disease is an emergent bacterial disease that affects swine husbandries worldwide causing important economic losses. The aetiological agent, Haemophilus parasuis, is currently divided in fifteen serovars but an increasing number of non-typeable serovars have been reported. Indirect hemagglutination (IHA) is indicated as a serotyping method for H. parasuis. In the present study, we describe an additional step that aims to work around a possible obstacle in the original protocol that may compromise the outcome of this assay. We observed that the choice of anticoagulant for blood collection influences and/or impairs spontaneous adsorption of H. parasuis antigens on sheep red blood cells (SRBCs). However, regardless of the anticoagulant...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Haemophilus parasuis; Diagnosis; Tannic acid; Serotyping; Indirect hemagglutination.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352017000100015

Detection of Diarrheagenic Escherichia coli in Bovine Meat in the Northern Region of Paraná State, Brazil
Provedor de dados: 52
Autores: Pelayo,Jacinta Sanchez; Elias Junior,Antonio Roberto; Lima,Nicole Ribeiro de; Navarro,Armando; Rocha,Sérgio Paulo Dejato da.
Abstract Ground bovine meat is commonly consumed by the population of Brazil. However, it constitutes an excellent medium for the multiplication of microorganisms due to available nutrients and handling practices prior to consumption. Here, we examined 100 samples of ground beef for the presence of diarrheagenic Escherichia coli (DEC) pathotypes by PCR, and characterized isolates by analyzing their adherence to HEp-2 cells, serotype, antimicrobial susceptibility, and phylogeny. Enteroaggregative E. coli was detected in five (5%) meat samples, Shiga toxin-producing E. coli in three (3%), and atypical enteropathogenic E. coli in two (2%). According to the phylogeny, six isolates (60%) were classified in group A, two (20%) in group B1, and two (20%) in group...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diarrheagenic Escherichia coli; Ground beef; Gastroenteritis; Serotyping.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132019000100502

Distribution of serotypes and evaluation of antimicrobial susceptibility among human and bovine Streptococcus agalactiae strains isolated in Brazil between 1980 and 2006
Provedor de dados: 55
Autores: Pinto,Tatiana Castro Abreu; Costa,Natália Silva; Souza,Aline Rosa Vianna; Silva,Ligia Guedes da; Corrêa,Ana Beatriz de Almeida; Fernandes,Flavio Gimenis; Oliveira,Ivi Cristina Menezes; Mattos,Marcos Corrêa de; Rosado,Alexandre Soares; Benchetrit,Leslie Claude.
Streptococcus agalactiae is a common agent of clinical and subclinical bovine mastitis and an important cause of human infections, mainly among pregnant women, neonates and nonpregnant adults with underlying diseases. The present study describes the genetic and phenotypic diversity among 392 S. agalactiae human and bovine strains isolated between 1980 and 2006 in Brazil. The most prevalent serotypes were Ia, II, III and V and all the strains were susceptible to penicillin, vancomycin and levofloxacin. Resistance to clindamycin, chloramphenicol, erythromycin, rifampicin and tetracycline was observed. Among the erythromycin resistant strains, mefA/E, ermA and, mainly, ermB gene were detected, and a shift of prevalence from the macrolide resistance phenotype...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Streptococcus agalactiae; Pulsed field gel electrophoresis; Epidemiology; Serotyping; Resistance profile.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702013000200003

Prevalence of pneumococcal serotypes and resistance to antimicrobial agents in patients with meningitis: ten-year analysis
Provedor de dados: 55
Autores: Alvares,Jackelline Rodrigues; Mantese,Orlando Cesar; Paula,Alan de; Wolkers,Paula Carolina Bejo; Almeida,Viviene Vieira Prado; Almeida,Samanta Cristine Grassi; Guerra,Maria Luiza Leopoldo Silva; Brandileone,Maria Cristina de Cunto.
OBJECTIVES: To determine the prevalence of pneumococcal serotypes and antimicrobial susceptibility in patients with meningitis, and to evaluate the implications for vaccine coverage. METHODS: Pneumococcal strains obtained from normally sterile fluids from patients admitted with meningitis were isolated at the Hospital de Clínicas of the Universidade Federal de Uberlândia, Minas Gerais State, and sent to the Instituto Adolfo Lutz, city of São Paulo, São Paulo State, for further identification, serotyping, and antimicrobial susceptibility determination. RESULTS: From April 1999 to April 2009, 338 pneumococcal strains were isolated, and 72 obtained from patients with meningitis, were analyzed. Patients' ages varied from one month to 82.2 years (mean of 18.4 ±...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Streptococcus pneumoniae; Meningitis; Serotyping; Pneumococcal vaccines; Drug resistance.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702011000100005

Production of monoclonal antibody to subtype 9 of Neisseria meningitidis and the distribution of this subtype in Brazil
Provedor de dados: 55
Autores: Belo,Elza F.T.; Coutinho,Ligia M.C.C.; Ferraz,Aline S.; De Gaspari,Elizabeth N.
A new monoclonal antibody (5F81A4P1.9), which is specific for subtype 9 antigen of meningococci, was studied. The antibodies were raised against a previously non-typable (NT) serogroup B strain from Brazilian patients and were found to react with the subtype antigen of prototype reference strains for subtype 9 (M982), as well as with those of homologous strains. The subtype 9 epitope was found in 6.8% of serogroup B strains among 602 strains of Neisseria meningitidis case isolates, including representative isolates from Brazilian states. Subtype P1.9 was predominantly related to serogroup B in Brazil among the isolates collected during the N. meningitidis epidemic in 1992. No significant differences were observed in the occurrence of subtype P1.9 among...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Neisseria meningitidis; Monoclonal antibodies; Brazilian meningococcus strains; Serotyping; Subtyping.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702004000600004

Bacteremic pneumococcal pneumonia: serotype distribution, antimicrobial susceptibility, severity scores, risk factors, and mortality in a single center in Chile
Provedor de dados: 55
Autores: Fica,Alberto; Bunster,Nicolás; Aliaga,Felipe; Olivares,Felipe; Porte,Lorena; Braun,Stephanie; Dabanch,Jeannette; Hormázabal,Juan Carlos; Hernández,Antonio; Benavides,María Guacolda.
AIMS:Bacteremic pneumococcal pneumonia (BPP) is a severe condition. To evaluate seasonal distribution, mortality, serotype frequencies, antimicrobial susceptibility, and different severity scores among patients with BPP.PATIENTS AND METHODS:Patients were identified by laboratory data and restricted to adulthood. Standard methods were used for serotyping and antimicrobial susceptibility. Risk factors were analyzed by univariate and multivariate methods. Severity scores (APACHE II, CURB-65 and CAP PIRO) were compared using ROC curves.RESULTS:Sixty events of community-acquired BPP occurred between 2005 and 2010. A seasonal pattern was detected. Mean age was 72.1 years old (81.4% &gt;60 years). All had a predisposing factor. Previous influenza (3.3%) or...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Streptococcus pneumoniae; Bacteremia; Serotyping; Microbial drug resistance; Risk factors; Mortality; Elderly; CURB-65; APACHE II; PIRO.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702014000200115

Two variants of HIV-1 B serotype are transmitted heterosexually in São Paulo, Brazil
Provedor de dados: 56
Autores: Casseb,J.; Hong,M.A.; Gonsalez,C.; Brígido,L.F.; Duarte,A.J.S.; Michael-Hendry,R.
HIV-1 variability may have an important impact on transmission and pathogenicity. Better characterization of the HIV epidemic in Brazil is necessary for the development of vaccine trials in this country. We analyzed sera from 108 HIV-1-infected volunteers from São Paulo City to determine serotype and reactivity for V3 motifs of HIV in this population, and the relationship to transmission mode. We concluded that the HIV-1 B serotype is frequent among heterosexually infected women, even in the absence of anal sex, and that two major V3 motifs, GPGR and GWGR, had similar prevalence among women (48% and 52%, respectively) and men (56% and 44%, respectively). We also observed an equal distribution of these strains regardless of their CD4+ T cell counts,...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: HIV; Serotyping; Gp 120 V3 loop; Synthetic peptides; Sexual transmission.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1998001000002

Phenotyping and genotyping methods applied to investigate the relatedness of Brazilian isolates of Enterobacter cloacae
Provedor de dados: 56
Autores: Darini,A.L.C.; Magalhães,V.D.; Levy,C.L.; Barth,A.L.; Coscina,A.L.
In order to evaluate the resolving power of several typing methods to identify relatedness among Brazilian strains of Enterobacter cloacae, we selected twenty isolates from different patients on three wards of a University Hospital (Orthopedics, Nephrology, and Hematology). Traditional phenotyping methods applied to isolates included biotyping, antibiotic sensitivity, phage-typing, and O-serotyping. Plasmid profile analysis, ribotyping, and macrorestriction analysis by pulsed-field gel electrophoresis (PFGE) were used as genotyping methods. Sero- and phage-typing were not useful since the majority of isolates could not be subtyped by these methods. Biotyping, antibiogram and plasmid profile permitted us to classify the samples into different groups...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Enterobacter cloacae; Phage-typing; Serotyping; Ribotyping; Pulsed-field gel electrophoresis; Nosocomial infection.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1999000900004

Techniques used to identify the Brazilian variant of HIV-1 subtype B
Provedor de dados: 56
Autores: Komninakis,S.; Fukumori,L.; Alcalde,R.; Cortina,M.; Abdala,L.; Brito,A.; Sanabani,S.; Duarte,A.J.S.; Casseb,J.
The purpose of the present study was to compare the sensitivity and specificity of V3 enzyme immunoassay (solid phase EIA and EIA inhibition) and restriction fragment length polymorphism (RFLP) with the DNA sequencing "gold standard" to identify the Brazilian HIV-1 variants of subtype B and B"-GWGR. Peripheral blood mononuclear cells were collected from 61 HIV-1-infected individuals attending a clinic in São Paulo. Proviral DNA was amplified and sequentially cleaved with the Fok I restriction enzyme. Plasma samples were submitted to a V3-loop biotinylated synthetic peptide EIA. Direct partial DNA sequencing of the env gene was performed on all samples. Based on EIA results, the sensitivity for detecting B-GPGR was 70%, compared to 64% for the Brazilian...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: HIV-1 subtyping; Brazilian subtype B variant; Serotyping; DNA sequencing.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2007000300003

Phenotypic and genotypic diversity of Pseudomonas aeruginosa strains isolated from hospitals in siedlce (Poland)
Provedor de dados: 58
Autores: Wolska,Katarzyna; Kot,Barbara; Jakubczak,Antoni.
A total of 62 Pseudomonas aeruginosa strains isolated from two hospitals in Siedlce (Poland) were studied by repetitive element based PCR (rep-PCR) using BOX primer. BOX-PCR results revealed the presence of 7 numerous genotypes and 31 unique patterns among isolates. Generally, the strains of P. aeruginosa were characterized by resistance to many antibiotics tested and by differences in serogroups and types of growth on cetrimide agar medium. However, the P. aeruginosa strains isolated from faeces showed much lower phenotypic and genotypic variations in comparison with strains obtained from other clinical specimens. It was observed that genetic techniques supported by phenotypic tests have enabled to conduct a detailed characterization of P. aeruginosa...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pseudomonas aeruginosa; BOX-PCR; Antibiotic resistance; Serotyping; Cetrimide agar.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822012000100032

Prevalence, serotyping and antimicrobials resistance mechanism of Salmonella enterica isolated from clinical and environmental samples in Saudi Arabia
Provedor de dados: 58
Autores: El-Tayeb,Mohamed A.; Ibrahim,Abdelnasser S.S.; Al-Salamah,Ali A.; Almaary,Khalid S.; Elbadawi,Yahya B.
Abstract Salmonella is recognized as a common foodborne pathogen, causing major health problems in Saudi Arabia. Herein, we report epidemiology, antimicrobial susceptibility and the genetic basis of resistance among S. enterica strains isolated in Saudi Arabia. Isolation of Salmonella spp. from clinical and environmental samples resulted in isolation of 33 strains identified as S. enterica based on their biochemical characteristics and 16S-rDNA sequences. S. enterica serovar Enteritidis showed highest prevalence (39.4%), followed by S. Paratyphi (21.2%), S. Typhimurium (15.2%), S. Typhi and S. Arizona (12.1%), respectively. Most isolates were resistant to 1st and 2nd generation cephalosporin; and aminoglycosides. Moreover, several S. enterica isolates...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Salmonella; Serotyping; Antibiotic resistance; Antimicrobials resistance determinants.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822017000300499

Characterization of mixed infections with different strains of bovine rotavirus in an outbreak of diarrhea in dairy herds in Goiás, Brazil
Provedor de dados: 58
Autores: Brito,Wilia Marta Elsner Diederichsen de; Munford,Veridiana; Villaça,André Martins; Caruzo,Thabata Alessandra Ramos; Rácz,Maria-Lucia.
Ten faecal samples of bovine rotavirus from calves less than 30 days old from an outbreak of diarrhea in Hidrolândia, Goiás, Brazil were submitted to serological and molecular characterization, using enzyme immunoassay for subgrouping and serotyping, PAGE for determination of electropherotypes and PCR for genome typing. Nine samples belonged to group A/subgroup I rotavirus and one sample was group A / subgroup non-I/non-II. Four samples were characterized as G10P[11] (B223-like), four samples showed a mixture of two rotavirus strains (G6G10 and P[5]P[11]), one sample was characterized as G6P[11] and one sample was characterized only by G serotyping/genotyping, and did not react with any P primer used. Two electropherotypes were detected and both were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rotavirus; Diarrhea; Bovine; Genotyping; Serotyping.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822000000200015

Prevalence and serotype distribution of Listeria monocytogenes isolated from foods in Montevideo-Uruguay
Provedor de dados: 58
Autores: Braga,Valeria; Vázquez,Sylvia; Vico,Victoria; Pastorino,Valeria; Mota,María Inés; Legnani,Marcela; Schelotto,Felipe; Lancibidad,Gustavo; Varela,Gustavo.
ABSTRACT The aim of this work was to study the prevalence of Listeria monocytogenes in foods obtained in retail shops and food industries located in Montevideo-Uruguay, and to identify the serogroups of the obtained isolates. Three-thousand one-hundred and seventy-five food samples (frozen, deli meats, ready-to-eat and cheese) were analyzed. The obtained isolates were serogrouped by multiplex PCR and serotyped by conventional procedure. Genetic comparisons were performed using pulsed-field gel electrophoresis on a sub-set of isolates belonging to the same serotype successively recovered from the same establishment. L. monocytogenes was isolated from 11.2% of samples. The highest prevalence was observed in frozen foods (38%), followed by cheese (10%). 1/2b...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Food-borne diseases; Listeriosis; Serotyping; Pulsed-field gel electrophoresis.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822017000400689

Antimicrobial resistance and serotyping of Streptococcus pneumoniae isolated from pediatric patients in Belo Horizonte, MG, Brazil
Provedor de dados: 58
Autores: Magalhães,Ana Paula Gomes de Oliveira; Pinto,Artur da Silveira.
Thirty one Streptococcus pneumoniae invasive strains were isolated from a pediatric population in Belo Horizonte from June, 1999 to May, 2001. Penicillin, trimethoprim-sulfamethoxazole, tetracycline and chloramphenicol resistance rates for the isolates were 41.9, 58.1, 25.8 and 3.2%, respectively. Intermediate penicillin resistant (MICs between 0.1 and 1.0 µg/ml) and resistant (MICs &gt; 2.0 µg/ml) isolates occured at rates of 38.7 and 3.2%, respectively. Resistance to erythromycin, ofloxacin, rifampin or vancomicyn was not detected. Ten S. pneumoniae serotypes (14, 5, 10 A, 6B, 15B, 18C, 6 A, 18 A, 19 A and 19 F) were identified. Serotype 14 (12 out of 31) was predominant among the isolates. Penicillin and trimethoprim-sulfamethoxazole resistance was more...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Streptococcus pneumoniae; Antimicrobial resistance; Serotyping.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822003000300005

Characterization of Listeria monocytogenes isolated from a fresh mixed sausage processing line in Pelotas-RS by PFGE
Provedor de dados: 58
Autores: von Laer,Ana Eucares; Lima,Andréia Saldanha de; Trindade,Paula dos Santos; Andriguetto,Cristiano; Destro,Maria Teresa; Silva,Wladimir Padilha da.
Listeria monocytogenes is a bacterium capable to adhere to the surfaces of equipment and utensils and subsequently form biofilms. It can to persist in the food processing environmental for extended periods of time being able to contaminate the final product. The aim of this study was to trace the contamination route of L. monocytogenes on a fresh mixed sausage processing line, from raw material to the final product. The isolates obtained were characterized by serotyping and molecular typing by pulsed-field gel electrophoresis (PFGE) using the restriction enzymes ApaI and AscI. L. monocytogenes was detected in 25% of the samples. The samples of raw material were not contaminated, however, the microorganism was detected in 21% of the environmental samples...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Listeria monocytogenes; PFGE; Serotyping; Persistent strains.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822009000300021

Genotypic profile of Listeria monocytogenes isolated in refrigerated chickens in southern Rio Grande do Sul, Brazil
Provedor de dados: 65
Autores: Mendonça,Karla Sequeira; Michael,Geovana Brenner; Nalério,Élen Silveira; Mendonça,Marcelo; Cardoso,Marisa Ribeiro Itapema; Silva,Wladimir Padilha da.
ABSTRACT: Listeria monocytogenes is of notable concern to the food industry, due to its ubiquitous nature and ability to grow in adverse conditions. This study aimed to determine the genotypic profile of L. monocytogenes strains isolated from refrigerated chickens marketed in the southern part of Rio Grande do Sul, Brazil. The strains of L. monocytogenes isolated were characterized by serotyping and Pulsed Field Gel Electrophoresis (PFGE). Three different serotypes (1/2a, 1/2b and 4e) were evaluated by PFGE, and the macrorestriction patterns utilizing enzymes AscI and ApaI, revealed five different pulsotypes. The presence of such varied genotypic profiles demonstrates the prevalence of L. monocytogenes contamination of chicken processing environments,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Contamination; Pathogen; Prevalence; Serotyping.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000100132