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| Registros recuperados: 29 | |
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| Chiareli,D.; Moreira,E.C.; Gutiérrez,H.O.D.; Rodrigues,R.O.; Marcelino,A.P.; Meneses,J.N.C.; Almeida,V.M.A.. |
| The goal of this research was to find the frequency and spatial distribution of infection caused by Leptospira interrogans in equidae in Minas Gerais State from September 2003 to March 2004. Samples of blood serum (6,475) were analyzed by microscopic agglutination test. From the total, 381 samples were positive (5.9 %), with title equal or superior to 1:200 for one or more serovars of leptospira. The most frequent serovars were Hardjo (Norma), Pomona, Bratislava, and Batavie. The higher frequency of equidae reagents were recorded at the North and Northeast region of Minas Gerais, followed by Triângulo Mineiro and Alto Paranaíba, then Central, West, Metropolitan area of Belo Horizonte, and South/Southwest. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Eqüideos; Leptospira; Freqüência; Distribuição espacial. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352008000600043 |
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| Diniz,S.; Sandes,S.H.C.; Bomfim,M.R.Q.; Santos,P.C.; Cruz,F.D.; Moreira,T.F.; Carvalho,M.R.S.; Cisalpino,P.S.; Moreira,E.S. A.. |
| ABSTRACT Bovine digital dermatitis (BDD) is an infectious and contagious disease characterized by ulcerative and proliferative lesions affecting the skin on the bulbs of the heel or the interdigital cleft in dairy cattle, often associated with lameness. Evidences on the etiology of BDD indicate that it is multifactorial, involving environmental factors and multiple bacterial colonization. We isolated and identified microorganisms from BDD biopsy samples obtained from five Holstein Friesian and two Jersey cows by cultivation and molecular identification of bacterial isolates using 16S rRNA gene sequence analysis. We identified six bacterial species: Spirochetes as Treponema pedis and Leptospira broomi/L. fainei, L. licerasiae/L. wolffii; Corynebacterium... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bovine digital dermatitis; Molecular identification; 16S rRNA gene analysis; Treponema; Leptospira. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352017000300559 |
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| SCHREIER,STEFAN; TRIAMPO,WANNAPONG; DOUNGCHAWEE,GALAYANEE; TRIAMPO,DARAPOND; CHADSUTHI,SUDARAT. |
| Leptospirosis caused by Leptospira interrogans is the most widespread zoonosis and a major public health problem worldwide. Based on light-scattering and absorption, quantification of leptospires using UV-VIS spectroscopy was used as an indirect counting technique by measuring the optical density and comparing this to automated direct counting using a counting chamber in combination with imaging and analyzing software. Two serovars, Bangkok and Copenhagenii, from log-phase growth were used for the establishment of standard curves. They were found to be linear and slightly different in gradient for each serovar. The ease, rapidity, and reliability of these two adapted and optimized counting techniques may provide a useful alternative enumeration technique... |
| Tipo: Journal article |
Palavras-chave: Leptospirosis; Leptospira; Enumeration; Spectroscopy; Indirect counting. |
| Ano: 2009 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000100001 |
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| LANGONI,Hélio; SEABRA JÚNIOR,Rui; CABRAL,Kenio Gouveia; CUNHA,Eva Laurice Pereira. |
| Baypamun® is an immunity modulator recommended as prophylactic and therapeutic use. In the present study, this product was used in the hamsters experimentally infected with Leptospira interrogans serogroup canicola. The animals were divided in 5 groups, with 20 animals each. This product was used as a therapeutic, prophylactic and as adjuvant. As a therapeutic use all the animals died. Despite of eight (40.0%) survivors, the prophylactic use wasn't also totally favorable due to leptospire recovering from kidneys of those animals. Based on the analysis of antibodies levels among animals that received vaccine and vaccine with Baypamun® as adjuvante, this product didn't conferred superior humoral answer. However, other studies should be accomplished utilizing... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Immunomodulators; Leptospira; Immunity. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-95962001000600010 |
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| Feng,C.Y.; Li,Q.T.; Zhang,X.Y.; Dong,K.; Hu,B.Y.; Guo,X.K.. |
| Genes encoding lipoproteins LipL32, LipL41 and the outer-membrane protein OmpL1 of leptospira were recombined and cloned into a pVAX1 plasmid. BALB/c mice were immunized with LipL32 and recombined LipL32-41-OmpL1 using DNA-DNA, DNA-protein and protein-protein strategies, respectively. Prime immunization was on day 1, boost immunizations were on day 11 and day 21. Sera were collected from each mouse on day 35 for antibody, cytokine detection and microscopic agglutination test while spleen cells were collected for splenocyte proliferation assay. All experimental groups (N = 10 mice per group) showed statistically significant increases in antigen-specific antibodies, in cytokines IL-4 and IL-10, as well as in the microscopic agglutination test and splenocyte... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Immune strategy; Recombinant vaccine; Leptospira; Lipoproteins LipL32; LipL41. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2009000900005 |
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| Lilenbaum,Walter; Kremer,Frederico; Ristow,Paula; Dellagostin,Odir; Bourhy,Pascale; Hartskeerl,Rudy; Vasconcellos,Silvio. |
| Two Leptospira sp. isolates were obtained by the first time from goats in Brazil and characterized by sequencing rrs, rpoB and secY genes, PFGE and typing with monoclonal antibodies. Both isolates are identical and belong to Leptospira santarosai. Analysis of the rrs and the rpoB genes sequences revealed 100% identity between the goat isolates and the Bananal reference strain. When secY sequences of the two isolates were compared to each other, it was observed that they had identical sequences. However, when compared to that of the Bananal reference strain, there were 15 mismatches along the 549 bp secY sequence. In conclusion, molecular methods are increasingly useful for the characterization of leptospires and allowed to identify those isolates of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Leptospira; Serogrouping; Sequencing; PFGE; Rrs. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822014000400050 |
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| Delbem,Ádina Cléia Botazzo; Freitas,Julio Cesar de; Bracarense,Ana Paula F. R. L.; Müller,Ernst Eckehardt; Oliveira,Rosângela Claret de. |
| Swine leptospirosis is recognized world wide as an important cause of reproductive failure. Serum and histo-pathological examinations have been constantly used to diagnose this disease. This study was carried out on slaughtered sows from Northern Paraná State to compare serum findings with kidney, liver, ovary and uterus histo-pathological examinations. The microscopic serum-agglutination carried out on 36 animals detected 24 with titles > 100 and 12 negative (< 100). The histopathological examinations made on livers, kidneys, ovaries and uterus stained with hematoxylin-eosin, were carried out on 16 randomly chosen animals, 11 from the groups with > 100 serological titles and five from the negative group. The results showed that all the 16 animals... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Leptospira; Swine; Diagnostic. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822002000200016 |
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| Forster,Karine M.; Hartwig,Daiane D.; Seixas,Fabiana K.; McBride,Alan J.A.; Monte,Leonardo G.; Recuero,Ana Lúcia C.; Brod,Claudiomar S.; Hartleben,Cláudia P.; Amaral,Marta; Dellagostin,Odir A.. |
| Pathogenic Leptospira spp. are the etiological agents of leptospirosis, an important disease of both humans and animals. In urban settings, L. interrogans serovars are the predominant cause of disease in humans. The purpose of this study was to characterize a novel Leptospira isolate recovered from an abandoned swimming pool. Molecular characterization through sequencing of the rpoB gene revealed 100% identity with L. interrogans and variable-number tandem-repeat (VNTR) analysis resulted in a banding pattern identical to L. interrogans serogroup Icterohaemorrhagiae, serovar Copenhageni or Icterohaemorrhagiae. The virulence of the strain was determined in a hamster model of lethal leptospirosis. The lethal dose 50% (LD50) was calculated to be two... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Leptospira; Leptospirosis; Virulent; VNTR; RpoB. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822013000100024 |
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| Tabata,Rosana; Scanavini Neto,Hugo; Zuanaze,Marcelo Alexandre Fagnani; Oliveira,Eugenia Márcia de Deus; Dias,Ricardo Augusto; Morais,Zenaide Maria de; Ito,Fumio Honma; Vasconcellos,Silvio Arruda. |
| Three leptospiral bacterins, produced with different serovars of Serogroup Sejroe, namely the hardjo (bacterin A), wolffi (bacterin B) and guaricura (bacterin C), were evaluated in male hamsters (Mesocricetus auratus) by comparing the agglutinating and neutralizing antibodies titers using microscopic agglutination (MAT) and in vitro growth inhibition (GIT) tests. The immunization schedule was based on two 1.0 mL doses of non-diluted formalininactivated whole culture bacterin given through subcutaneous route with 10-day interval. The challenge was performed ten days after the second vaccine dose, when the animals were inoculated with 0.2 mL of non-inactivated cultures of each serovar through intraperitoneal route. On the 21st post-challenge day (PCD), all... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Leptospira; Bacterins; Hamsters; Neutralizing antibodies; Serogroup Sejroe. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822002000300016 |
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| Jung,Lenice Roteia Cardoso; Bomfim,Maria Rosa Quaresma; Kroon,Erna Geessien; Nunes,Álvaro Cantini. |
| Leptospires are usually classified by methods based on DNA-DNA hybridization and the conventional cross-agglutination absorption test, which uses polyclonal antibodies against lipopolysaccharides. In this study, the amplification of the rpoB gene, which encodes the beta-subunit of RNA polymerase, was used as an alternative tool to identify Leptospira. DNA extracts from sixty-eight serovars were obtained, and the hypervariable region located between 1990 and 2500-bp in the rpoB gene was amplified by polymerase chain reaction (PCR). The 600-bp amplicons of the rpoB gene were digested with the restriction endonucleases TaqI, Tru1I, Sau3AI and MslI, and the restriction fragments were separated by 6% polyacrylamide gel electrophoresis. Thirty-five fragment... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Leptospira; RpoB gene; RFLP; Serovar; DNA typing. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822015000200465 |
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| Seyffert,Núbia; Silva,Éverton Fagonde da; Bermudez,Viviane Lorenzato; Brod,Claudiomar Soares. |
| In leptospirosis, the Microscopic Agglutination Test (MAT) is the basis of serological diagnosis and the most widely used. In our study, the MAT was applied to evaluate the influence of temperature, incubation time, antigen density and age of the culture in the agglutinability of Leptospires and the interference of these factors in diagnosis. Three serum samples with titers of 100, 800 and 25.600 to the serovar tande (local isolate) of canicola serogroup were used with different combinations among the four factors. There was a significant relation among all factors, specially between the antigen density and age of the culture. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Leptospira; Microscopic agglutination; Leptospirosis; Laboratorial diagnosis. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822003000500025 |
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| Karcher,Daniel; Grenfell,Rafaella C.; Moreno,Andrea Micke; Moreno,Luisa Zanolli; Vasconcellos,Silvio Arruda; Heinemann,Marcos B.; Almeida Junior,Joao N. de; Juliano,Luiz; Juliano,Maria A.. |
| ABSTRACT Matrix Assisted Laser Desorption/Ionization and Time of Flight mass spectrometry (MALDI-TOF MS) is a powerful tool for the identification of bacteria through the detection and analysis of their proteins or fragments derived from ribosomes. Slight sequence variations in conserved ribosomal proteins distinguish microorganisms at the subspecies and strain levels. Characterization of Leptospira spp. by 16S RNA sequencing is costly and time-consuming, and recent studies have shown that closely related species (e.g., Leptospira interrogans and Leptospira kirschneri) may not be discriminated using this technology. Herein, we report an in-house Leptospira reference spectra database using Leptospira reference strains that were validated with a collection... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Leptospira; Brazil; Identification; Mass spectrometry; MALDI-TOF. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822018000400900 |
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| Langoni,Hélio; Del Fava,Claudia; Cabral,Kenio de Gouvêa; Silva,Aristeu Vieira da; Chagas,Sérgio Aguiar Pacheco. |
| Foram estudadas aglutininas antileptospíricas em 403 amostras de soro de búfalos, provenientes de sete Municípios do Vale do Ribeira, Estado de São Paulo, coletadas no período de janeiro de 1992 a junho de 1993. Utilizou-se o teste de soroaglutinação microscópica, considerando-se positivas as amostras cujo título fosse igual ou superior a 100. O maior título encontrado foi 1600 para o sorovar bratislava (1 amostra), seguido de 800 para wolffi (4 amostras). Do total, 152 (37,7%) das amostras foram positivas, sendo que, dentre os sorovares testados, a prevalência em ordem decrescente foi: wolffi (68, 44,8%), icterohaemorrhagiae (51, 33,6%), hardjo (51, 33,6%), castellonis (25, 16,5%), djasiman (12, 7,9%), grippotyphosa (10, 6,6%), pomona (8, 5,2%),... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Leptospira; Soroaglutinação microscópica; Búfalos. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84781999000200019 |
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| Langoni,H.; Da Silva,A.V.; Pezerico,S.B.; De Lima,V.Y.. |
| Equine leptospirosis can present a non-symptomatic form, an acute clinical form, or even develop chronically, causing reproductive alterations, such as abortion and recurrent uveitis. Since the prevalence of leptospirosis in several countries and regions is widely reported, the objective of this study was to verify the prevailing equine leptospirosis in different regions of Brazil. Sera from 1402 blood samples from horses of different age, sex, breed, and purpose were examined. These samples came from southeastern and central west states of Brazil. The method utilized was the Microscopic Agglutination Test (MAT), with 12 different Leptospira serovars. From the sera tested, 754 (54%) were positive for one (385) or more (372) serovars. These results were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Leptospira; Horse; Serology. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992004000300003 |
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| Registros recuperados: 29 | |
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