Resultado da pesquisa (3)
Termo utilizado na pesquisa complexo Mycobacterium avium
#1 - Nasal swab real-time PCR is not suitable for in vivo diagnosis of bovine tuberculosis, 37(6):549-554
Abstract in English:
ABSTRACT.- Mayer F.Q., Reis E.M., Bezerra A.V.A., Rodrigues R.O., Michel T., Cerva C. & Bertagnolli A.C. 2017. Nasal swab real-time PCR is not suitable for in vivo diagnosis of bovine tuberculosis. Pesquisa Veterinária Brasileira 37(6):549-554. Laboratório de Biologia Molecular, Instituto de Pesquisas Veterinárias Desidério Finamor, Fundação Estadual de Pesquisa Agropecuária, Estrada Municipal do Conde 6000, Eldorado do Sul, RS 92990-000, Brazil. E-mail: bimmayer@gmail.com
Bovine tuberculosis (bTB) is a zoonosis causing economic losses and public health risks in many countries. The disease diagnosis in live animals is performed by intradermal tuberculin test, which is based on delayed hypersensitivity reactions. As tuberculosis has complex immune response, this test has limitations in sensitivity and specificity. This study sought to test an alternative approach for in vivo diagnosis of bovine tuberculosis, based on real-time polymerase chain reaction (PCR). DNA samples, extracted from nasal swabs of live cows, were used for SYBR® Green real-time PCR, which is able to differentiate between Mycobacterium tuberculosis and Mycobacterium avium complexes. Statistical analysis was performed to compare the results of tuberculin test, the in vivo gold standard bTB diagnosis method, with real-time PCR, thereby determining the specificity and sensitivity of molecular method. Cervical comparative test (CCT) was performed in 238 animals, of which 193 had suitable DNA from nasal swabs for molecular analysis, as indicated by amplification of glyceraldehyde-3-phosphate dehydrogenase (GAPDH) gene, and were included in the study. In total, 25 (10.5%) of the animals were CCT reactive, of which none was positive in the molecular test. Of the 168 CCT negative animals, four were positive for M. tuberculosis complex at real time PCR from nasal swabs. The comparison of these results generated values of sensitivity and specificity of 0% and 97.6%, respectively; moreover, low coefficients of agreement and correlation (-0.029 and -0.049, respectively) between the results obtained with both tests were also observed. This study showed that real-time PCR from nasal swabs is not suitable for in vivo diagnosis of bovine tuberculosis; thus tuberculin skin test is still the best option for this purpose.
Abstract in Portuguese:
RESUMO.- Mayer F.Q., Reis E.M., Bezerra A.V.A., Rodrigues R.O., Michel T., Cerva C. & Bertagnolli A.C. 2017. Nasal swab real-time PCR is not suitable for in vivo diagnosis of bovine tuberculosis. [A PCR em tempo real de swab nasal não é adequada para o diagnóstico in vivo de tuberculose bovina.] Pesquisa Veterinária Brasileira 37(6):549-554. Laboratório de Biologia Molecular, Instituto de Pesquisas Veterinárias Desidério Finamor, Fundação Estadual de Pesquisa Agropecuária, Estrada Municipal do Conde 6000, Eldorado do Sul, RS 92990-000, Brazil. E-mail: bimmayer@gmail.com
A tuberculose bovina (bTB) é uma zoonose que causa perdas econômicas e riscos à saúde pública em muitos países. O diagnóstico da doença em animais vivos é realizado pelo teste intradérmico da tuberculina, que é baseado em reações de hipersensibilidade tardia. Como a tuberculose tem resposta imunológica complexa, este teste tem limitações em termos de sensibilidade e especificidade. Este estudo procurou desenvolver uma abordagem alternativa para o diagnóstico in vivo da tuberculose bovina, com base na reação em cadeia da polimerase (PCR) em tempo real. As amostras de DNA, extraídas de suabes nasais de vacas vivas, foram usadas para PCR em tempo real com SYBR® Green, capaz de diferenciar os complexos Mycobacterium tuberculosis e Mycobacterium avium. A análise estatística foi realizada para comparar os resultados de teste de tuberculina, padrão ouro para o diagnóstico in vivo da bTB, com PCR em tempo real, determinando-se assim a especificidade e sensibilidade do método molecular. O teste cervical comparativo (TCC) foi realizado em 238 animais, dos quais 193 tiveram DNA dos suabes nasais adequados para análise molecular, como indicado pela amplificação do gene gliceraldeído-3-fosfato-desidrogenase (GAPDH), e foram incluídos no estudo. No total, 25 (10,5%) animais foram reativos no TCC, dos quais nenhum foi positivo no teste molecular. Dos 168 animais negativos no TCC, quatro foram positivos para o complexo M. tuberculosis na PCR em tempo real a partir dos suabes nasais. A comparação destes resultados gerou valores de sensibilidade e especificidade de 0% e 97,6%, respectivamente; além disso, baixos coeficientes de concordância e correlação (-0,029 e -0,049, respectivamente) entre os resultados obtidos com ambos os testes também foram observados. Este estudo mostrou que a PCR em tempo real a partir de suabes nasais não é adequada para o diagnóstico in vivo da tuberculose bovina; portanto, o teste da tuberculina ainda é a melhor opção para este fim.
#2 - Linfadenite granulomatosa em suínos: linfonodos afetados e diagnóstico patológico da infecção causada por agentes do Complexo Mycobacterium avium, p.13-17
Abstract in English:
ABSTRACT.- Morés N., Ventura L., Dutra V., Silva V.S., Barioni Jr W., Oliveira S.R, Kramer B. & Ferreira Neto J.S. 2007. [Granulomatous lymphadenitis in swine: lymph nodes affected and pathologic diagnosis of the infection caused by Mycobacterium avium Complex agents.] Linfadenite granulomatosa em suínos: linfonodos afetados e diagnóstico patológico da infecção causada por agentes do Complexo Mycobacterium avium. Pesquisa Veterinária Brasileira 27(1):13-17. Embrapa Suínos e Aves, Cx. Postal 21, Concórdia, SC 89700-000, Brazil. E-mail: mores@cnpsa.embrapa.br
A study to evaluate the distribution of granulomatous lesions in the lymph nodes of swine carcasses was accomplished. The main objective was to compare the methods of isolation of mycobacteria of the Mycobacterium avium Complex (MAC), Ziehl-Neelsen (ZN) staining, histopathological examination and immunohistochemistry (IHC) for the diagnosis of granulomatous lymphadenitis caused by MAC. A total of 431 samples of lymph nodes from 394 swine carcasses kept in 12 cold storage rooms of southern Brazil, which had the Service of Federal Inspection (SFI), were analyzed. Lymph nodes with granulomatous lesions were submitted to histological examination, ZN staining and IHC with monoclonal antibody produced with cellular extract of M. avium. The agreement between the exams was measured by the Kappa test at a 95% confidence level. The macrocospic examination done by SFI correctly identified 90.3% of granulomatous lesions, when compared with histological examination, and the majority of carcasses (92.5%) showed the lesions only in lymph nodes of the alimentary chain. Histological examination confirmed the presence of granulomatous lesions in 90.3% of the lymph nodes. The agreements between histological examination, ZN staining (Kappa: 0.342), IHC and the isolation of MAC (Kappa: 0.102) were low, however high between IHC and histology with typical presence of granulomas in the lymph nodes (Kappa: 0.973). IHC together with histological examination revealed to be efficient for identification of the granulomatous lymphadenitis caused by MAC.
Abstract in Portuguese:
ABSTRACT.- Morés N., Ventura L., Dutra V., Silva V.S., Barioni Jr W., Oliveira S.R, Kramer B. & Ferreira Neto J.S. 2007. [Granulomatous lymphadenitis in swine: lymph nodes affected and pathologic diagnosis of the infection caused by Mycobacterium avium Complex agents.] Linfadenite granulomatosa em suínos: linfonodos afetados e diagnóstico patológico da infecção causada por agentes do Complexo Mycobacterium avium. Pesquisa Veterinária Brasileira 27(1):13-17. Embrapa Suínos e Aves, Cx. Postal 21, Concórdia, SC 89700-000, Brazil. E-mail: mores@cnpsa.embrapa.br
A study to evaluate the distribution of granulomatous lesions in the lymph nodes of swine carcasses was accomplished. The main objective was to compare the methods of isolation of mycobacteria of the Mycobacterium avium Complex (MAC), Ziehl-Neelsen (ZN) staining, histopathological examination and immunohistochemistry (IHC) for the diagnosis of granulomatous lymphadenitis caused by MAC. A total of 431 samples of lymph nodes from 394 swine carcasses kept in 12 cold storage rooms of southern Brazil, which had the Service of Federal Inspection (SFI), were analyzed. Lymph nodes with granulomatous lesions were submitted to histological examination, ZN staining and IHC with monoclonal antibody produced with cellular extract of M. avium. The agreement between the exams was measured by the Kappa test at a 95% confidence level. The macrocospic examination done by SFI correctly identified 90.3% of granulomatous lesions, when compared with histological examination, and the majority of carcasses (92.5%) showed the lesions only in lymph nodes of the alimentary chain. Histological examination confirmed the presence of granulomatous lesions in 90.3% of the lymph nodes. The agreements between histological examination, ZN staining (Kappa: 0.342), IHC and the isolation of MAC (Kappa: 0.102) were low, however high between IHC and histology with typical presence of granulomas in the lymph nodes (Kappa: 0.973). IHC together with histological examination revealed to be efficient for identification of the granulomatous lymphadenitis caused by MAC.
#3 - Prevalence and distribution of serotypes of micobacteria of the MAIS- Complex isolated from pigs in Brazil
Abstract in English:
From the mandibular lymph nodes of 4,645 swines collected at slaughteredhouses from the States of Paraná, Rio de Janeiro, Minas Gerais, Goiás (Distrito Federal) and Pernambuco, were detected 374 (8.0%) tuberculous or tuberculous like lesions. The bacteriological examination of the 374 altered lymph nodes and another 266 apparently normal organs permitted the isolation of 174 mycobacteria belonging to the Mycobacterium avium-intracellulare-scrofukzceum complex. The serological characterization of the MAIS complex showed that 156 cultures were belong to 16 serotypes of the Schaefer's classification system. The most prevalent serotypes were: 8 (Davis), 7 (VII), 12 (Howetl), 4 (IV), 15 (Dent) and 6 (VI). No M avium serotypes could be identified. The distribution at the different regions showed more prevalence of the serotypes 4, 8 and 12 in Paraná; 7, 8 and 15 in Rio de Janeiro; 7, 8 and 15 in Minas Gerais and in Goiás; 4, 7 and 8 in Pernambuco.
Abstract in Portuguese:
Foram isoladas 174 culturas de micobactérias de 374 linfonodos cervicais portadores de lesões tuberculosas ou tuberculóides e de outros 266 gânglios normais, colhidos de 4.645 suínos de abate procedentes dos Estados do Paraná, Rio de Janeiro, Minas Gerais, Goiás (Distrito Federal) e Pernambuco; pelas características culturais e bioquímicas, essas micobactérias foram consideradas como pertencentes ao complexo Mycobacterium avium-intracellulare-scrofulaceum. A tipagem sorológica, segundo a técnica de Schaefer (1965), permitiu identificar 156 culturas pertencentes a 16 sorotipos do complexo MAIS, destacando-se, por ordem de freqüência, os sorotipos 8 (Davis), 7 (VII), 12 (Howell), 4 (IV), 15 (Dent) e 6 (VI). Não foram encontrados os sorotipos, 1, 2 e 3 de M. avium. A distribuição dos sorotipos por regiões revelou maior prevalência dos sorotipos 4, 8 e 12 no Paraná; 7, 8 e 15 no Rio de Janeiro, também 7, 8 e 15 em Minas Gerais e em Goiás; 4, 7 e 8 em Pernambuco.
