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Serology using rROP2 antigen in the diagnostic of toxoplasmosis in pregnant women; Sorologia utilizando o antígeno recombinante ROP2 no diagnóstico da toxoplasmose em mulheres grávidas

MACRE, Miriam de Souza; PIRES, Márcio; MEIRELES, Luciana Regina; ANGEL, Sérgio O.; ANDRADE JR., Heitor Franco de
Fonte: Instituto de Medicina Tropical Publicador: Instituto de Medicina Tropical
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
36.88%
Toxoplasma gondii causes severe fetal disease during acute infection in pregnant women, thus demanding early diagnosis for effective treatment and fetus preservation. Fetal tests are inefficient and risky, and diagnosis is based on maternal IgM serology, which had weak screening ability due to increased sensitivity, with alternative IgG avidity tests. Here, we performed ELISA and avidity assays using a recombinant T. gondii antigen, rROP2, in samples from 160 pregnant women screened from a large public hospital who were referred due to positive IgM assays. IgG serology and avidity assays were compared using whole T. gondii extract or rROP2. ELISA IgG detection with rROP2 showed good agreement with assays performed with T. gondii extract, but rROP2 IgG avidity assays were unrelated to whole extract antigen IgG avidity, regardless of the chaotrope used. These data show that avidity maturation is specific to individual antigen prevalence and immune response during infection. ELISA rROP2 IgG assays may be an alternative serological test for the diagnosis of toxoplasmosis during pregnancy, although our data do not support their use in avidity assays.; A toxoplasmose causa grave doença fetal durante a infecção aguda da gestante, assim demanda diagnóstico precoce para tratamento efetivo e preservação fetal. Os testes fetais são de baixa eficiência e o diagnóstico é baseado na sorologia para IgM materna...

Diagnóstico de laboratório da sífilis adquirida e congênita e definição das fases clínicas da doença por western-blotting; Industrialization and evaluation of Western blotting method - WB Tp-IgG - as confirmatory for syphilis serology

Lemos, Elaine Antunes de
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 13/09/2002 PT
Relevância na Pesquisa
36.75%
A sífilis adquirida e a congênita continuam aumentando e preocupando as autoridades sanitárias do mundo, ao verem que as metas estabelecidas para o seu controle estão longe de serem atingidas. Apesar dos esforços feitos na descoberta de novas ferramentas para o diagnóstico e monitoramento da sífilis, vemos um despreparo muito grande, principalmente entre os laboratoristas, em processar corretamente os reagentes disponíveis e melhor selecionar aqueles que apresentem qualidade para serem usados na rotina do laboratório. O que constatamos neste estudo é um espelho da realidade do diagnóstico da sífilis e mostra a dificuldade que os clínicos enfrentam ao receberem um laudo do laboratório. Trabalhando em colaboração com diferentes serviços e grupos de pesquisa, selecionamos aqueles que trabalhavam com: gestantes atendidas no pré-natal, doadores de sangue, pacientes infectados pelo HIV e pacientes de laboratório clínico e fizemos um estudo crítico da sorologia utilizada em cada serviço. Verificamos discrepância dos resultados obtidos nos testes não-treponêmicos VDRL e RPR, principalmente entre os soros de baixa reatividade, e nos treponêmicos FTA-abs, TPHA e ELISA. Decidimos aplicar o método de Western blotting e analisar o seu comportamento em todas as amostras de soros ensaiadas. Para obtenção de resultados reprodutíveis...

Industrialização e avaliação do método de Western blotting - WB Tp-IgG - como confirmatório na sorologia da sífilis; Industrialization and evaluation of Western blotting method - WB Tp-IgG - as confirmatory for syphilis serology

Lemos, Elaine Antunes de
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 17/08/2007 PT
Relevância na Pesquisa
36.75%
A sífilis adquirida e a congênita continuam aumentando e preocupando as autoridades sanitárias do mundo, ao verem que as metas estabelecidas para o seu controle estão longe de serem atingidas. Apesar dos esforços feitos na descoberta de novas ferramentas para o diagnóstico e monitoramento da sífilis, vemos um despreparo muito grande, principalmente entre os laboratoristas, em processar corretamente os reagentes disponíveis e melhor selecionar aqueles que apresentem qualidade para serem usados na rotina do laboratório. O que constatamos neste estudo é um espelho da realidade do diagnóstico da sífilis e mostra a dificuldade que os clínicos enfrentam ao receberem um laudo do laboratório. Trabalhando em colaboração com diferentes serviços e grupos de pesquisa, selecionamos aqueles que trabalhavam com: gestantes atendidas no pré-natal, doadores de sangue, pacientes infectados pelo HIV e pacientes de laboratório clínico e fizemos um estudo crítico da sorologia utilizada em cada serviço. Verificamos discrepância dos resultados obtidos nos testes não-treponêmicos VDRL e RPR, principalmente entre os soros de baixa reatividade, e nos treponêmicos FTA-abs, TPHA e ELISA. Decidimos aplicar o método de Western blotting e analisar o seu comportamento em todas as amostras de soros ensaiadas. Para obtenção de resultados reprodutíveis...

Serum and Urinary C-Reactive Protein Concentrations in Dogs with Leptospirosis

Oliveira, Simone Tostes de; Messick, Joanne Belle; Biondo, Alexander Welker; Santos, Andrea Pires dos; Guimarães, Ana Marcia Sá; Mohamed, Ahmed Sidi; Pires Neto, Jose Antonio Simoes; Dalmolin, Magnus Larruscaim; Diaz Gonzalez, Félix Hilário
Fonte: Universidade Federal do Rio Grande do Sul Publicador: Universidade Federal do Rio Grande do Sul
Tipo: Artigo de Revista Científica Formato: application/pdf
POR
Relevância na Pesquisa
27.13%
Background: Leptospirosis is a bacterial disease caused by pathogenic strains of Leptospira, which may affect human beings and a wide range of both domestic and wild animals. The disease in dogs is still a challenge for clinicians, since definitive diagnosis may be reached only few days after overt clinical signs. Besides that, dogs with leptospiruria have zoonotic risk, making development of rapid screening tests crucial for early diagnosis of disease. C-reactive protein is a positive acute phase protein, and in the dog a strong and fast response is expected after any tissue injury. The aim of this study was to evaluate serum and urinary C-reactive protein as potential early indicators of leptospirosis in dogs, and its association with clinical serum biochemistry, complete blood count (CBC) and clinical outcome. Materials, Methods & Results: A total of 62 dogs with risk factors and/or clinical signs of leptospirosis were prospectively obtained and included in this study. Definitive diagnosis was based on serology, using the microscopic agglutination test (MAT) against 13 serovars, and on a specific polymerase chain reaction (PCR) in blood or urine, using the primers sets G1/G2 and B64I/B64II, which amplify DNA of pathogenic leptospires. ( Continuation)Clinical serum biochemistry included creatinine...

Definition of a diagnostic routine in individuals with inconclusive serology for chagas disease

Picka, Mariele Cristina Modolo; Meira, Domingos Alves; Carvalho, Thaís Batista de; Peresi, Eliana; Marcondes-Machado, Jussara
Fonte: Brazilian Society of Infectious Diseases Publicador: Brazilian Society of Infectious Diseases
Tipo: Artigo de Revista Científica Formato: 226-233
ENG
Relevância na Pesquisa
37.04%
Despite the existence of highly sensitive tests, inconclusive serological results are frequent in chronic chagasic infection. This study aimed to define a diagnostic conduct for 30 individuals with inconclusive serology (G3) for chagasic infection assisted at the Outpatient Unit for Infectious and Parasitic Diseases of the Botucatu School of Medicine. Twenty-one individuals with negative serology (G1) and 33 with positive serology (G2) were also studied. Serological methods ELISA, HAI, IFI and immunoblotting TESA-cruzi were used for G1, G2 and G3, and parasitological methods xenodiagnosis, hemoculture and PCR-LIT were used for G2 and G3 individuals. ELISA, HAI and IFI were performed in 5 different blood samples in G2 and G3. TESA-cruzi was carried out only once in G1, G2 and G3 and, since it is the most sensitive, it was utilized as standard. In G3, positivity for ELISA reached 86% in the fifth blood sample; the ELISA+HAI+IFI combination showed a maximum of 44.8% in the second sample; and TESA-cruzi, 76% in one single sample. Xenodiagnosis positivity was 9.4%; hemoculture showed 15.2%; and PCR-LIT exhibited 22% positivity in G2. Nevertheless, in G3, positivity percentage was 3.4% for xenodiagnosis, 6.7% for PCR-LIT, and no positive result was found for hemoculture. In G3...

Sorologia anti-IgG para detecção da infecção pulmonar por Pseudomonas aeruginosa em pacientes com fibrose cística atendidos no Hospital de Clínicas da Universidade Estadual de Campinas; Anti-IgG serology for detection of Pseudomonas aeruginosa pulmonary infection in cystic fibrosis patients attended at the Campinas State University Hospital

Renan Marrichi Mauch
Fonte: Biblioteca Digital da Unicamp Publicador: Biblioteca Digital da Unicamp
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 06/08/2014 PT
Relevância na Pesquisa
36.75%
A Fibrose Cística (FC) é uma doença genética decorrente da disfunção da proteína reguladora da condutância transmembrana (CFTR), essencial para o transporte de íons e água pela membrana celular, sendo a doença pulmonar a mais preponderante das manifestações, havendo colonização bacteriana seguida de infecções, principalmente por Pseudomonas aeruginosa, bactéria de maior relevância para pacientes com FC. Neste estudo, buscamos padronizar e avaliar o valor diagnóstico e prognóstico de um teste de ELISA (Enzyme-linked immunosorbent assay) para pesquisa de anticorpos séricos IgG anti-P. aeruginosa, comparando os resultados com a cultura microbiológica de material respiratório (padrão-ouro atual). Os níveis de anticorpos foram avaliados primeiramente em um estudo transversal, com 117 pacientes com FC atentidos no HC-Unicamp, buscando determinar a acurácia do teste, e paralelamente em um estudo longitudinal, com 78 pacientes inicialmente sem infecção crônica por P. aeruginosa, buscando monitorar a variação dos níveis de anticorpos em diferentes períodos de coleta de amostras. Observamos que a taxa de soropositividade e a mediana dos níveis de IgG anti-Pseudomonas foram significativamente maiores em pacientes cronicamente infectados pela bactéria...

Multiple sclerosis and positive lyme serology

Lana-Peixoto,Marco Aurélio
Fonte: Academia Brasileira de Neurologia - ABNEURO Publicador: Academia Brasileira de Neurologia - ABNEURO
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/12/1994 EN
Relevância na Pesquisa
36.75%
As Lyme neuroborreliosis (LNB) may clinically mimick multiple sclerosis (MS) the presence of antibodies to Borrelia burgdorferi in serum of patients with a MS-like disease in non-edemic areas for Lyme disease may be troublesome. We report the case of a 45-year-old white female with the diagnosis of relapsing/ remitting form of MS due to a 15-year history of optic neuritis and recurrent episodes of motor and sensation disturbance in the upper right limb and in both lower extremites associated with bladder dysfunction. A magnetic resonance imaging of the brain revealed multiple high intensity periventricular white matter lesions. The patient had been exposed to ticks but did not recall the presence of erythema migrans. ELISA for Lyme disease was positive in two different laboratories and the positive serology was confirmed by Western blotting. No convincing reponse followed treatment with ceftriaxone. Although it is clear that the patient had been infect by Borrelia burgdorferi the relationship of this spirochetal infection with the neurological disease could not be ascertained.

Comparison of serology, antigenemia assay and the polymerase chain reaction for monitoring active cytomegalovirus infections in hematopoietic stem cell transplantation patients

Bonon,Sandra Helena Alves; Rossi,Cláudio Lúcio; Souza,Cármino Antonio de; Vigorito,Afonso Celso; Costa,Sandra Cecília Botelho
Fonte: Instituto de Medicina Tropical Publicador: Instituto de Medicina Tropical
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/10/2006 EN
Relevância na Pesquisa
36.98%
Forty-six allogeneic hematopoietic stem cell transplantation (HSCT) patients were monitored for the presence of CMV antibodies, CMV-DNA and CMV antigens after transplantation. Immunoenzymatic serological tests were used to detect IgM and the increase in CMV IgG antibodies (increase IgG), a nested polymerase chain reaction (N-PCR) was used to detect CMV-DNA, and an antigenemia assay (AGM) was used to detect CMV antigens. The presence of CMV-IgM and/or CMV-increase IgG antibodies was detected in 12/46 (26.1%) patients, with a median time between HSCT and the detection of positive serology of 81.5 days. A positive AGM was detected in 24/46 (52.2%) patients, with a median time between HSCT and antigen detection of 62 days. Two or more consecutive positive N-PCR results were detected in 32/46 (69.5%) patients, with a median time between HSCT and the first positive PCR of 50.5 days. These results confirmed that AGM and mainly PCR are superior to serology for the early diagnosis of CMV infection. Six patients had CMV-IgM and/or CMV-increase IgG with a negative AGM (five cases) or N-PCR assay (one case). In five of these cases the serological markers were detected during the first 100 days after HSCT, the period of highest risk. These findings support the idea that serology may be useful for monitoring CMV infections in HSCT patients...

Serology using rROP2 antigen in the diagnostic of toxoplasmosis in pregnant women

Macre,Miriam de Souza; Pires,Márcio; Meireles,Luciana Regina; Angel,Sérgio O.; Andrade Jr.,Heitor Franco de
Fonte: Instituto de Medicina Tropical Publicador: Instituto de Medicina Tropical
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/10/2009 EN
Relevância na Pesquisa
36.88%
Toxoplasma gondii causes severe fetal disease during acute infection in pregnant women, thus demanding early diagnosis for effective treatment and fetus preservation. Fetal tests are inefficient and risky, and diagnosis is based on maternal IgM serology, which had weak screening ability due to increased sensitivity, with alternative IgG avidity tests. Here, we performed ELISA and avidity assays using a recombinant T. gondii antigen, rROP2, in samples from 160 pregnant women screened from a large public hospital who were referred due to positive IgM assays. IgG serology and avidity assays were compared using whole T. gondii extract or rROP2. ELISA IgG detection with rROP2 showed good agreement with assays performed with T. gondii extract, but rROP2 IgG avidity assays were unrelated to whole extract antigen IgG avidity, regardless of the chaotrope used. These data show that avidity maturation is specific to individual antigen prevalence and immune response during infection. ELISA rROP2 IgG assays may be an alternative serological test for the diagnosis of toxoplasmosis during pregnancy, although our data do not support their use in avidity assays.

An appraisal of the epidemiology of Trypanosoma cruzi serology in Brazil

Feitosa,M. F.; Krieger,H.
Fonte: Instituto Oswaldo Cruz, Ministério da Saúde Publicador: Instituto Oswaldo Cruz, Ministério da Saúde
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/1991 EN
Relevância na Pesquisa
36.98%
A large bibliographic survey provided data on Trypanosoma cruzi serology covering the period l948-l984. Epidemiological-demographic methods provided an estimate of 11% for the prevalenceof positive serology in Brazil, by 1984. Significant temporal trends were observed for most of the Brazilian geographical regions as well as for Brazil, as a whole. The parabolic curve that fit best for the entire country, indicates that by 1991, the incidence of new positive serology would be close to zero. This conclusion needs further fine-adjustment, since the forecast point is somewhat distant from the measured period.

A new survey of the serology of human Trypanosoma cruzi infection in the Rio Negro microregion, Brazilian Amazon: a critical analysis

Coura,José Rodrigues; Marquez,Maurício Humberto Peña; Guerra,Jorge Augusto de Oliveira; Zauza,Patricia Lago; Miguel,Julio Cesar; Pereira,José Borges
Fonte: Instituto Oswaldo Cruz, Ministério da Saúde Publicador: Instituto Oswaldo Cruz, Ministério da Saúde
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/11/2013 EN
Relevância na Pesquisa
36.75%
The serology of human Trypanosoma cruzi infection in the Rio Negro microregion is very complex because of the large numbers of false-positive cases that result from low antibody titres and cross-reactions with other infections. In the present study, we collected 4,880 blood samples on filter paper; of these, indirect immunofluorescence (IIF) was strongly reactive in 221 (4.5%), which were considered to be positive (IIF strongly reactive; high intensity of fluorescence) and weakly reactive in 302 (6.2%), which were considered to be doubtful (IIF weakly reactive; low intensity of fluorescence). The confirmatory test on the serum using at least two of three techniques (IIF, conventional ELISA and recombinant ELISA) on 137 samples that were positive in the screening test only confirmed 33 cases (24.1%). Of the 178 samples that were considered doubtful in the screening test, only 10 (5.6%) were considered to be positive in the confirmatory test. Finally, we recommend that the serological diagnosis of T. cruzi infection in the Amazon region be made using at least two different techniques, for example immunofluorescence and ELISA and confirmed by Western blot analysis when possible.

Definition of a diagnostic routine in individuals with inconclusive serology for chagas disease

Picka,Mariele Cristina Modolo; Meira,Domingos Alves; Carvalho,Thaís Batista de; Peresi,Eliana; Marcondes-Machado,Jussara
Fonte: Brazilian Society of Infectious Diseases Publicador: Brazilian Society of Infectious Diseases
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/04/2007 EN
Relevância na Pesquisa
37.04%
Despite the existence of highly sensitive tests, inconclusive serological results are frequent in chronic chagasic infection. This study aimed to define a diagnostic conduct for 30 individuals with inconclusive serology (G3) for chagasic infection assisted at the Outpatient Unit for Infectious and Parasitic Diseases of the Botucatu School of Medicine. Twenty-one individuals with negative serology (G1) and 33 with positive serology (G2) were also studied. Serological methods ELISA, HAI, IFI and immunoblotting TESA-cruzi were used for G1, G2 and G3, and parasitological methods xenodiagnosis, hemoculture and PCR-LIT were used for G2 and G3 individuals. ELISA, HAI and IFI were performed in 5 different blood samples in G2 and G3. TESA-cruzi was carried out only once in G1, G2 and G3 and, since it is the most sensitive, it was utilized as standard. In G3, positivity for ELISA reached 86% in the fifth blood sample; the ELISA+HAI+IFI combination showed a maximum of 44.8% in the second sample; and TESA-cruzi, 76% in one single sample. Xenodiagnosis positivity was 9.4%; hemoculture showed 15.2%; and PCR-LIT exhibited 22% positivity in G2. Nevertheless, in G3, positivity percentage was 3.4% for xenodiagnosis, 6.7% for PCR-LIT, and no positive result was found for hemoculture. In G3...

Serology for Helicobacter pylori compared with symptom questionnaires in screening before direct access endoscopy.

Mendall, M A; Jazrawi, R P; Marrero, J M; Molineaux, N; Levi, J; Maxwell, J D; Northfield, T C
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /03/1995 EN
Relevância na Pesquisa
27.21%
This prospective study aimed to compare serology for Helicobacter pylori with two, symptom questionnaires in screening patients before direct access endoscopy. Methods were compared in terms of the number of endoscopies saved and pathology missed in 315 patients referred to a gastroenterology unit by 65 local GPs. The serology used was based on an acid glycine extract of H pylori. One in-house questionnaire was based on the Glasgow dyspepsia (GLADYS) system and the other questionnaire was that reported by Holdstock et al. A cut off point of 6.3 U/ml for H pylori serology was selected for screening patients (97% sensitive and 75% specific). Serology was combined with a history of NSAID usage in determining who should have endoscopy. For the in-house questionnaire, a cut off score of more than 8 out of a possible maximum of 18 was chosen, after prior evaluation in 118 patients referred for direct access endoscopy (the sensitivity for detection of peptic ulcer was 88%, specificity 61%). A cut off score of more than 412 was used for the Holdstock questionnaire. In patients under 45 years, serology detected more peptic ulcers than the in-house questionnaire and the Holdstock questionnaire (27/28 v 24/28, NS and v 20/28, p < 0.05 respectively). The Holdstock questionnaire saved significantly more endoscopies than the other two methods (76/149 v 57/149 for the in-house questionnaire...

Avaliação de diferentes métodos para a classificação de pacientes e de carreadores de antígenos empregados na sorologia de hanseníase; Evaluation of different methods for classification of leprosy patients and antigen carriers employed in leprosy serology

Moura, Rodrigo Scaliante de
Fonte: Universidade Federal de Goiás; Brasil; UFG; Programa de Pós-graduação em Medicina Tropical e Saúde Publica (IPTSP); Instituto de Patologia Tropical e Saúde Pública - IPTSP (RG) Publicador: Universidade Federal de Goiás; Brasil; UFG; Programa de Pós-graduação em Medicina Tropical e Saúde Publica (IPTSP); Instituto de Patologia Tropical e Saúde Pública - IPTSP (RG)
Tipo: Tese de Doutorado Formato: application/pdf
POR
Relevância na Pesquisa
36.88%
Serology to detect IgM antibodies against the PGL-I, a species-specific antigen from Mycobacterium leprae, can be used to aid in the identification of individuals with high bacillary load. Samples and the database from the U-MDT clinical trial were used to compare and report the perfomance of diverse classification methods. This study also evaluated the possibility of enhancement of serological tests by substituting the antigen carrier protein, the bovine serum albumin (BSA) by a human protein (HSA), aiming to eliminate unespecific bindings. The tests specificity was evaluated using sampes from household contacts, healthy population, TB patients and Visceral Leishmaniasis from endemic and non-endemic areas. In this study the most sensitive and the least specific approach was represented by counting the number of skin lesions, which identifiel 99% of MB leprosy patients. ML Flow HSA tests correcty allocated 70.9% and 68.6% of patients in the PB group, and 87% and 81% of patients in the MB group, respectively. The study suggests that the carrier protein of the antigen did not influence significantly in the seropositivity of studied groups. PGL-I serology did not presented cross-reactions with Visceral Leishmaniasis serum samples and confirmed a low positivity among control groups.; Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq; A sorologia para detecção de anticorpos da classe IgM contra o PGL-I...

Peroxidase antibody test for mucocutaneous leishmaniasis serology performance indexes and comparison with a fluorescent antibody test: Comparação com o desempenho da reação de imunofluorescência

Celeste,Beatriz J.; Guimarães,M. Carolina S.; Corrales L.,Edelma Maria
Fonte: Instituto de Medicina Tropical Publicador: Instituto de Medicina Tropical
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/12/1988 EN
Relevância na Pesquisa
36.75%
Performance indexes of the peroxidase antibody test were compared to that of the fluorescent antibody test. The peroxidase antibody test had a statistically higher sensitivity and negative predictive value and a higher efficiency than the fluorescent antibody test but its specificity and positive predictive value were within the 95% confidence limits for the values found for the fluorescent antibody test. Such differences did not change when Chagas' disease and visceral leishmaniasis sera were included in index calculations. Statistical analysis showed that the two tests have a substantial degree of agreement but the immunofluorescent test had a specificity index and a positive predictive value equal to 100.0% when Chagas' disease and visceral leishmaniasis sera were not included in the calculations of the performance index; in this instance, a positive test result equals a disclosure of the disease attribute due to the inexistence of false positive results. The enzyme/ protein ratio of the peroxidase conjugate, resulting in heavy or light-labeled conjugates may pose technical problems to its use in serology tests.

Sorologia utilizando o antígeno recombinante ROP2 no diagnóstico da toxoplasmose em mulheres grávidas; Serology using rROP2 antigen in the diagnostic of toxoplasmosis in pregnant women

Macre, Miriam de Souza; Pires, Márcio; Meireles, Luciana Regina; Angel, Sérgio O.; Andrade Jr., Heitor Franco de
Fonte: Universidade de São Paulo. Instituto de Medicina Tropical de São Paulo Publicador: Universidade de São Paulo. Instituto de Medicina Tropical de São Paulo
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; ; ; ; Formato: application/pdf
Publicado em 01/10/2009 ENG
Relevância na Pesquisa
36.88%
A toxoplasmose causa grave doença fetal durante a infecção aguda da gestante, assim demanda diagnóstico precoce para tratamento efetivo e preservação fetal. Os testes fetais são de baixa eficiência e o diagnóstico é baseado na sorologia para IgM materna, que tem fraca capacidade de triagem devido a sensibilidade crescente dos testes, sendo uma alternativa os testes de avidez de IgG. Apresentamos aqui um ELISA e ensaio de avidez de IgG usando antígeno recombinante de T. gondii, rROP2, em amostras de 162 gestantes triadas para um grande hospital público por uma sorologia positiva para IgM. O ELISA IgG e o ensaio de avidez de IgG foram comparados usando o antígeno rROP2 ou extrato total de T. gondii. O ELISA usando rROP2 mostrou excelente concordância com os ensaios usando extrato de T. gondii, mas nos ensaios de avidez usando rROP2, os valores encontrados não se relacionaram com os encontrados na avidez com extrato de T. gondii, independente do tipo de caotrópico utilizado. Estes dados mostram que a maturação da avidez é especifica para a resposta imune ou a prevalência de um antígeno durante a infecção. Os ELISA para IgG anti rROP2 podem ser teste sorológico alternativo para o diagnóstico da toxoplasmose durante a gravidez...

Teste de imunoperoxidase para a sorologia da leishmaniose mueocutânea; Peroxidase antibody test for mucocutaneous leishmaniasis serology performance indexes and comparison with a fluorescent antibody test: Comparação com o desempenho da reação de imunofluorescência

Celeste, Beatriz J.; Guimarães, M. Carolina S.; Corrales L., Edelma Maria
Fonte: Universidade de São Paulo. Instituto de Medicina Tropical de São Paulo Publicador: Universidade de São Paulo. Instituto de Medicina Tropical de São Paulo
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; ; ; ; Formato: application/pdf
Publicado em 01/12/1988 ENG
Relevância na Pesquisa
36.75%
Os parâmetros sorológicos do teste de imunoperoxidase foram comparados aos do teste de imunofluorescência. O teste de imunoperoxidase mostrou ter sensibilidade e valor de predição negativo estatisticamente mais alto que aqueles do teste de imunofluorescência porém, os limites de confiança 95% da especificidade e do valor de predição positivo estavam contidos naqueles encontrados para o teste de imunofluorescência. Tais diferenças se mantiveram quando os cálculos dos índices foram feitos com e sem a inclusão de soros de doença de Chagas ou leishmaniose visceral. A análise estatística mostrou que os dois testes tinham um grau substancial de concordância mas o teste de imunofluorescência tinha um índice de especificidade e o vaior de predição positivo igual a 100,0% quando os soros de Chagas e leishmaniose visceral foram excluídos. Neste caso. o teste positivo se torna o teste diagnóstico da doença em face da não existência de falso-positivos. O conjugado de peroxidase poderá se constituir em fonte de problemas técnicos na sorologia se a relação enzima proteína se afastar das quantidades ótimas de marcação.; Performance indexes of the peroxidase antibody test were compared to that of the fluorescent antibody test. The peroxidase antibody test had a statistically higher sensitivity and negative predictive value and a higher efficiency than the fluorescent antibody test but its specificity and positive predictive value were within the 95% confidence limits for the values found for the fluorescent antibody test. Such differences did not change when Chagas' disease and visceral leishmaniasis sera were included in index calculations. Statistical analysis showed that the two tests have a substantial degree of agreement but the immunofluorescent test had a specificity index and a positive predictive value equal to 100.0% when Chagas' disease and visceral leishmaniasis sera were not included in the calculations of the performance index; in this instance...

Estudo comparativo entre sorologia, antigenemia e reação em cadeia da polimerase para o monitoramento da infecção por citomegalovírus em pacientes receptores de transplantes de células progenitoras hematopoéticas; Comparison of serology, antigenemia assay and the polymerase chain reaction for monitoring active cytomegalovirus infections in hematopoietic stem cell transplantation patients

Bonon, Sandra Helena Alves; Rossi, Cláudio Lúcio; Souza, Cármino Antonio de; Vigorito, Afonso Celso; Costa, Sandra Cecília Botelho
Fonte: Universidade de São Paulo. Instituto de Medicina Tropical de São Paulo Publicador: Universidade de São Paulo. Instituto de Medicina Tropical de São Paulo
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; ; ; ; Formato: application/pdf
Publicado em 01/10/2006 ENG
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Quarenta e seis pacientes receptores de transplantes de células progenitoras hematopoéticas (TCPH) foram monitorados em relação à infecção ativa por citomegalovírus (CMV). Testes sorológicos imunoenzimáticos foram utilizados para a detecção de anticorpos IgM e elevação significativa das concentrações de anticorpos IgG (aumento IgG), nested-PCR (N-PCR) foi utilizada para a detecção de CMV-DNA e antigenemia (AGM) para a detecção de antígenos virais. A presença de CMV-IgM e/ou CMV-aumento IgG foi detectada em 12/46 (26,1%) pacientes, sendo o tempo mediano entre o transplante e a detecção dos marcadores sorológicos de 81,5 dias; AGM positiva foi detectada em 24/46 (52,2%) pacientes, sendo o tempo mediano entre o transplante e a detecção de antígenos virais de 62 dias. Dois ou mais resultados positivos consecutivos de N-PCR foram detectados em 32/46 (69,5%) pacientes, sendo o tempo mediano entre o transplante e o primeiro teste positivo de 50,5 dias. Esses resultados confirmaram que a AGM e principalmente a PCR são superiores à sorologia, com relação ao diagnóstico da infecção pelo CMV. Seis pacientes apresentaram reações CMV-IgM positivas e/ou CMV-aumento IgG com reações negativas de AGM (cinco casos) ou N-PCR (um caso). Em cinco desses casos...

Serology for human papillomavirus

Coursaget,Pierre
Fonte: Instituto Nacional de Salud Pública Publicador: Instituto Nacional de Salud Pública
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2003 EN
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Difficulties with serology for papillomavirus are associated with the large number of human papillomavirus, cross-reactions between papillomavirus, and to the diversity of lesions and target sites for infection. In addition, the expression of the papillomavirus in the superficial layers of the epithelium gives rise to the weak presentation to immunocompetent cells of viral antigens, which in turn gives rise to a weak serological response. Distinct efforts have been made in previous decades to develop more specific and sensitive serological assays. These former studies use fusion proteins and synthetic peptides, although they remain on the whole uninteresting, due to their lack of sensitivity and specificity. Only in the last few years, and principally due to the advent of various virus-like particles (VLP), have more sensitive and specific assays become available.

Serology for human papillomavirus

Coursaget,Pierre
Fonte: Instituto Nacional de Salud Pública Publicador: Instituto Nacional de Salud Pública
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2003 EN
Relevância na Pesquisa
36.75%
Difficulties with serology for papillomavirus are associated with the large number of human papillomavirus, cross-reactions between papillomavirus, and to the diversity of lesions and target sites for infection. In addition, the expression of the papillomavirus in the superficial layers of the epithelium gives rise to the weak presentation to immunocompetent cells of viral antigens, which in turn gives rise to a weak serological response. Distinct efforts have been made in previous decades to develop more specific and sensitive serological assays. These former studies use fusion proteins and synthetic peptides, although they remain on the whole uninteresting, due to their lack of sensitivity and specificity. Only in the last few years, and principally due to the advent of various virus-like particles (VLP), have more sensitive and specific assays become available.