Visando conhecer os dados epidemiológicos, a etiologia, patogenia, recursos diagnósticos, mecanismos de transmissão, tratamento, prevenção e controle da tuberculose causada pelo Mycobacterium bovis no homem, bovinos e reservatórios animais, realizou-se essa revisão bibliográfica para rever a situação da tuberculose humana causada por essa micobactéria, em termos mundiais, uma vez que os dados disponíveis no Brasil são precários. Constatou-se a grande preocupação de que a pandemia HIV/AIDS aumente o número de casos de tuberculose humana causada por M.bovis, a exemplo do que ocorreu nos casos de tuberculose humana por M.tuberculosis. Analisou-se detalhadamente os principais reservatórios animais de M. bovis existentes, com destaque àqueles de maior importância na transmissão da tuberculose humana e animal devida a este agente. Verificou-se os mecanismos de transmissão conhecidos em sua cadeia de hospedeiros, uma das mais amplas entre todos os patógenos existentes. Constatou-se os avanços das técnicas diagnósticas no campo da biologia molecular, visando uma melhor discriminação das cepas de M.bovis e M.tuberculosis. Foram abordados os problemas causados por tratamentos inadequados com drogas antituberculosas, os quais podem induzir o aparecimento de cepas multidroga-resistentes. Evidenciou-se uma urgente necessidade de maiores pesquisas sobre o desempenho de testes diagnósticos usados nos programas de controle e também para as questões de vacinação e quimioterapia. A efetiva colaboração entre a tríade microbiologistas médicos e veterinários e profissionais de saúde pública, torna-se essencial para a investigação dessa micobactéria de importância histórica e contemporânea. Existe, portanto, a necessidade de uma política de aporte de recursos materiais, humanos e financeiros, que envolvam uma cooperação internacional de órgãos vinculados à saúde pública, corroborando as recomendações da Organização Mundial da Saúde, divulgadas em Genebra em 1993 / Seeking to know the epidemic data, etiology, pathogeny, diagnostics resources, transmission mechanisms, treatment, prevention and control of the tuberculosis caused by the Mycobacterium bovis in man, bovine and animal reservoirs, it took place this bibliographical revision to review the situation of the human tuberculosis caused by that mycobacteria worldwide, since there are few available data in Brazil. There is a great concern whether the pandemic HIV/AIDS will increase the number of cases of human tuberculosis caused by M.bovis, as occurred due to Mycobacterium tuberculosis. It was analyzed the main animal reservoirs of M.bovis existent in full detail, with emphasis to those of larger importance in the transmission of the human and animal tuberculosis due to this agent. The transmission mechanisms were verified in its hosts chain, one of the widest among all the existent pathogens. The progress of the diagnostic technics in the field of the molecular biology, seeking a better strains discrimination of M.bovis and M.tuberculosis was evidenced. The problems caused by inadequate treatments with antituberculosis drugs, which can induce the appearing of multidrug-resistants strains, were approached. An urgent need of larger researches was evidenced on the performance of diagnostics tests used in the control programs and, also, for the vaccination subjects and chemotherapy. The effective collaboration between the triad medical and veterinary microbiologists and professionals of public health, is essential for the investigation of that mycobacteria of historical and contemporary importance. There is, therefore, the need of a material, human and financial resources policy, involving international cooperation of organs linked to the public health, corroborating the recommendations of World Health Organization, published in Geneva in 1993

Deux enquêtes épidémiologiques mises en place dans les forêts de Brotonne et de Mauny, en Normandie, ont montré que la tuberculose à Mycobacterium bovis était présente à des pourcentages de prévalence importants chez les cerfs élaphes (Cervus elaphus) et les sangliers (Sus scrofa). La souche de M. bovis isolée est la même que celle qui circule dans les élevages bovins voisins depuis au moins 1995. Les sensibilité, spécificité et valeurs prédictives de l'examen nécropsique en tant qu'outil diagnostique indiquent qu'il peut être utilisé pour suivre la maladie dans les populations de cerfs élaphes où la tuberculose bovine est bien installée. La différence du cadre lésionnel entre les cerfs et les sangliers suggère que le cerf joue un rôle plus important dans la dissémination de l'infection. Un modèle déterministe montre qu'une stratégie de lutte fondée sur l'éradication des cerfs élaphes et sur un ramassage exhaustif de viscères permettrait d'obtenir une disparition de l'infection.

Interferon regulatory factor-8 (Irf-8), a hematopoietic transcriptional regulator, controls myeloid-cell proliferation and coordinates innate and adaptive host immune responses. Mice from the BXH-2 recombinant inbred strain carry an endogenous R294C mutation in Irf-8. This loss-of-function mutation induces clonal infiltration of undifferentiated Mac-1+/Gr-1 + granulocytic precursors in BXH-2 mice, extramedullary hematopoiesis, and splenomegaly similar to those seen in human chronic myeloid leukemia. It also renders the host permissible to the otherwise avirulent Mycobacterium bovis (BCG), and negatively affects survival or recovery of these mice to other infectious pathogens. Here, we generated a polyc1onal anti-Irf-8 antibody to better characterize the effects of the R294C mutation on Irf-8 protein expression, stability, and inducibility in hematopoietic and non-hematopoietic tissues. We found that mutant Irf-8C294-expressing tissues consistently displayed reduced Irf-8 abundance compared to their wild-type counterparts in both primary splenocytes and following transfection into heterologous cells, presumably due to decreased stability or increased rate of degradation of the mutant isoform. Results also indicate that native Irf-8 is also expressed in the heart, and to a lesser extent, in the kidneys. Since neither of these organs is well-known to be associated with hematopoietic or immune functions, this finding strengthens the possibility that Irf-8 may exert additional regulatory functions in other cellular contexts. Taken together, our study provides a better understanding about the molecular features of the mutant Irf-8 C294 protein and contributes to a growing body of evidence in support of Irf-8 expression in non-hematopoietic tissues.

Despite Africa accounting for ~20% of the global cattle population, prevalence estimates and related risk factors of bovine tuberculosis (bTB), caused by Mycobacterium bovis, are still poorly quantified in many countries across the continent. Control of bTB in Africa is difficult due to poor monitoring of cattle movements and limited abattoir surveillance. Also M. bovis is zoonotic and risk factors for transmission include living in close contact with cattle and consumption of unpasteurised milk. Cattle keeping is integral to some rural populations in Cameroon and understanding the epidemiology of bTB in cattle populations is important both to bovine and public health. Detection of bTB in cattle is difficult due to variability of immune responses to M. bovis infection. The interferon-γ (IFN-γ) assay maybe useful to estimate bTB prevalence and identify bTB risk factors in Cameroon. However its performance can vary at different stages of bTB pathogenesis and in different cattle populations. Recently Fasciola hepatica co-infections have been reported to suppress IFN-γ responses in M. bovis infected cattle but the potential effect with F. gigantica co-infections on bTB prevalence estimates in Cameroon is unknown. An abattoir study was conducted in Cameroon to assess the performance of the IFN-γ assay. In 2012-13; 2064 slaughtered cattle were sampled from Bamenda abattoir (North West Region; NWR) and Ngaoundere abattoir (Vina Division; VD). Individual animal data was collected from routine meat inspection including identification of bTB and Fasciola pathology. Cattle were also tested for bTB using the IFN-γ assay and an M. bovis antibody ELISA. In the absence of a gold-standard diagnostic, the IFN-γ assay was compared to other diagnostic tests to assess agreement and identify factors that affected performance of the assay. Agreement between IFN-γ assay, TB lesion identification and an M. bovis antibody ELISA was poor-moderate, probably partly related to differences in immune response detected. A presence of Fasciola gigantica also increased the odds of false negative IFN-γ assay results. On further investigation co-infected cattle had increased odds of TB lesions and reduced IFN-γ responses that potentially could lead to ~20% reduction in test sensitivity. In an attempt to take into account the potential impact of F. gigantica, when estimating bTB prevalence, an antibody ELISA was developed to detect the exposure in live cattle. To highlight the awareness of disease in cattle-rearing communities, estimate prevalence and identify risk factors of bTB in cattle populations; two cross-sectional studies were conducted in 2013. A stratified clustered cross-sectional study of pastoral cattle herds, in the NWR and the VD, sampled 1448 pastoral cattle reared by 100 pastoralists. A smaller cross-sectional study sampled 60 dairy cattle from 46 small-holder co-operative dairy farmers. Individual animal data and herd-level data were collected and animals were screened by both the single comparative intradermal skin test (SCITT) and IFN-γ assay. Awareness of zoonotic TB was low yet consumption of raw milk was high in cattle-keeping communities highlighting the need for accurate bTB prevalence estimates. Despite the high awareness of the clinical presentation of bTB, clinical signs identified by pastoral herdsmen were not associated with cattle being bTB positive. The SCITT was used to compare two manufacturers cut offs for the IFN-γ assay, ≥0.05 and ≥0.1, and highlighted that these two diagnostics may detect different populations of bTB positive cattle. Using the IFN-γ assay at ≥0.1, bTB prevalence was highest in dairy cattle (21.67%) and was also present in pastoral cattle in the NWR and VD (11.33% and 6.55% respectively). Importantly, as F. gigantica is endemic in Cameroon and its influence could mean the true prevalence of bTB could be higher. Female pastoral cattle were at lower odds of being IFN-γ assay positive potentially due to immunosuppressive factors had lower odds of disease. Husbandry practices also decreased the odds of being IFN-γ assay positive such as drinking from streams, antelope and contact with herds at grazing. Age increased the odds of pastoral cattle being IFN- assay positive potentially being a confounder to chronicity of bTB and other co-infections may influence IFN-γ responses. Dairy cattle herds had different risk factors for being IFN- positive likely due to differences in husbandry practices. Considering the potential risk to public health of M. bovis this thesis highlights the extent of bTB across two major cattle keeping regions in Cameroon and the public health risk in cattle-rearing communities. Furthermore the relationship between Fasciola co-infection and IFN- responses to M. bovis described has potential implications for bTB diagnosis in cattle populations where the parasite is present across the globe.

Mycobacterium bovis, agent étiologique de la tuberculose bovine (bTB), affecte principalement les bovins mais évolue également dans des systèmes multi-hôtes. La France possède le statut UE indemne de bTB depuis 2000, mais la prévalence de la maladie a augmenté régulièrement ces cinq dernières années. Son contrôle passe par la connaissance des nouveaux facteurs de risque. Pour les déceler, nous avons étudié l’évolution spatio-temporelle de la bTB via la caractérisation des souches isolées de foyers français depuis 1978. A partir de plus de 2.000 souches, environ 600 profils génétiques ont été définis par spoligotypage et typage MLVA. Les groupes majoritairement identifiés, SB0120, SB0134, SB0121 et la «famille F4», sont différenciés plus finement par le MLVA qui augmente la puissance des études d’épidémiologie moléculaire. La diminution de la variabilité génétique et des changements de la distribution géographique des souches s’explique par des modifications dans les pratiques d’élevages et par la prolifération de certains génotypes évoluant dans des systèmes multi-hôtes. L’identification des groupes clonaux existants en France est confirmée par l’étude de mutations SNP effectuée suite au séquençage total de 82 génomes sélectionnés. De nouveaux outils de typage visant à affiner l’identification des souches, définir des profils de transmission méconnus et établir des liens épidémiologiques entre animaux sauvages et de rente sont envisagés. / Myobacterium bovis is the causative agent of bovine tuberculosis (bTB), principally affecting cattle but also evolving in multi-host livestock-wildlife systems. Prevalence is regularly increasing in France, an EU bTB-free state since 2000’s, after a 50 year collective fighting-campaign. To control the disease, it is necessary to acknowledge new risk factors. For identifying them, we have studied the spatial-temporary evolution of the disease by characterizing M. bovis strains causative of French outbreaks since 1978. Within more than 2,000 strains, around 600 profiles could be defined by spoligotyping and MLVA. SB0120, SB0134, SB0121 and the « F4 family » are the major spoligotypes isolated. In these groups, the refinement of differentiation can be increased by MLVA typing for powerful molecular epidemiological studies. Decreases in genetically and geographical variability could be explained by changes in husbandry practices and by the proliferation of unique genotypes in multi-host systems. Identification of clonal groups coexisting in France is confirmed by the study of SNPs mutations deduced from the whole genome sequencing of 82 representative strains. New typing tools for refining strains identification and disclosing unknown transmission patterns between livestock and wildlife are foreseeable

Visando conhecer os dados epidemiológicos, a etiologia, patogenia, recursos diagnósticos, mecanismos de transmissão, tratamento, prevenção e controle da tuberculose causada pelo Mycobacterium bovis no homem, bovinos e reservatórios animais, realizou-se essa revisão bibliográfica para rever a situação da tuberculose humana causada por essa micobactéria, em termos mundiais, uma vez que os dados disponíveis no Brasil são precários. Constatou-se a grande preocupação de que a pandemia HIV/AIDS aumente o número de casos de tuberculose humana causada por M.bovis, a exemplo do que ocorreu nos casos de tuberculose humana por M.tuberculosis. Analisou-se detalhadamente os principais reservatórios animais de M. bovis existentes, com destaque àqueles de maior importância na transmissão da tuberculose humana e animal devida a este agente. Verificou-se os mecanismos de transmissão conhecidos em sua cadeia de hospedeiros, uma das mais amplas entre todos os patógenos existentes. Constatou-se os avanços das técnicas diagnósticas no campo da biologia molecular, visando uma melhor discriminação das cepas de M.bovis e M.tuberculosis. Foram abordados os problemas causados por tratamentos inadequados com drogas antituberculosas, os quais podem induzir o aparecimento de cepas multidroga-resistentes. Evidenciou-se uma urgente necessidade de maiores pesquisas sobre o desempenho de testes diagnósticos usados nos programas de controle e também para as questões de vacinação e quimioterapia. A efetiva colaboração entre a tríade microbiologistas médicos e veterinários e profissionais de saúde pública, torna-se essencial para a investigação dessa micobactéria de importância histórica e contemporânea. Existe, portanto, a necessidade de uma política de aporte de recursos materiais, humanos e financeiros, que envolvam uma cooperação internacional de órgãos vinculados à saúde pública, corroborando as recomendações da Organização Mundial da Saúde, divulgadas em Genebra em 1993 / Seeking to know the epidemic data, etiology, pathogeny, diagnostics resources, transmission mechanisms, treatment, prevention and control of the tuberculosis caused by the Mycobacterium bovis in man, bovine and animal reservoirs, it took place this bibliographical revision to review the situation of the human tuberculosis caused by that mycobacteria worldwide, since there are few available data in Brazil. There is a great concern whether the pandemic HIV/AIDS will increase the number of cases of human tuberculosis caused by M.bovis, as occurred due to Mycobacterium tuberculosis. It was analyzed the main animal reservoirs of M.bovis existent in full detail, with emphasis to those of larger importance in the transmission of the human and animal tuberculosis due to this agent. The transmission mechanisms were verified in its hosts chain, one of the widest among all the existent pathogens. The progress of the diagnostic technics in the field of the molecular biology, seeking a better strains discrimination of M.bovis and M.tuberculosis was evidenced. The problems caused by inadequate treatments with antituberculosis drugs, which can induce the appearing of multidrug-resistants strains, were approached. An urgent need of larger researches was evidenced on the performance of diagnostics tests used in the control programs and, also, for the vaccination subjects and chemotherapy. The effective collaboration between the triad medical and veterinary microbiologists and professionals of public health, is essential for the investigation of that mycobacteria of historical and contemporary importance. There is, therefore, the need of a material, human and financial resources policy, involving international cooperation of organs linked to the public health, corroborating the recommendations of World Health Organization, published in Geneva in 1993

No description available.

Orientador: Antonio Carlos Paes / Resumo: Um protocolo de coleta, extração e amplificação de ácidos nucléicos (ANs) utilizando a técnica de PCR em tempo real para detecção de Mycobacterium bovis (M. bovis) e/ou Mycobacterium tuberculosis (M. tuberculosis) foi testado em 60 linfonodos provenientes de bovinos. Desses 60, 30 foram provenientes de bovinos suspeitos de tuberculose bovina (TBb), outros 30 apresentavam lesões nodulares classificadas como adenite pelo Serviço de Inspeção Federal (SIF), na linha de abate. Os resultados obtidos demonstraram que dos 30 linfonodos coletados suspeitos de TBb, 24 (80%) foram confirmados positivos para M. bovis e/ou M. tuberculosis e seis (20%) foram confirmados negativos. Dos 30 linfonodos com a presença de lesões nodulares do tipo adenite, 13 (43,33%) foram positivos para TBb e 17 (56,66%) foram negativos para TBb. Não há um teste diagnóstico rápido e preciso para detecção da TBb, diante disso o presente estudo desenvolveu um método de diagnóstico para a TBb baseado em PCR em tempo real com análise da fluorescência do corante SYBR Green. Estes resultados indicaram que o PCR em tempo real foi específico e sensível para a detecção e identificação dos dois alvos selecionados para detectar a TBb, com melhores resultados para o DNA genômico, quando comparado com o RNA ribossômico. O teste padronizado de qPCR para o diagnóstico da TBb permitiu uma maior acurácia e significativa redução do tempo de diagnóstico em relação aos métodos tradicionais de identificação da TBb. / Abstract: A protocol for the collection, extraction and amplification of nucleic acids (ANs) using a PCR technique for detection of Mycobacterium bovis (M. bovis) and / or Mycobacterium tuberculosis (M. tuberculosis) was tested on 60 bovine-derived lymph nodes. . Of these 60, 30 were included in cattle suspected of having bovine tuberculosis (TBb), another 30 had sclerias classified as adenites by the Federal Inspection Service (SIF), at the slaughter line. The results showed that the 30 lymph nodes with suspected TBb, 24 (80%) were confirmed positive for M. bovis and / or M. tuberculosis and six (20%) were confirmed negative. Of the 30 lymph nodes with adenitis nodular lesions, 13 (43.33%) were positive for TBb and 17 (56.66%) were negative for TBb. TBB, together with the present study for a diagnostic method for TBB, is a real-time test with SYBR Green dye fluorescence analysis. Results compared with real-time PCR were specific and sensitive for the identification and identification of the two targets selected to detect a TBb, with samples obtained for genomic DNA, when observed with ribosomal RNA. The standardized qPCR test for the diagnosis of tuberculosis allowed for greater accuracy and a significant reduction in diagnosis time in relation to TBb identification parameters. / Doutor

Submitted by Luciana Ferreira (lucgeral@gmail.com) on 2014-09-15T14:55:25Z No. of bitstreams: 2 Dissertacao_2009_Joyce_Lobo.pdf: 1055257 bytes, checksum: c6fb4445c47b40e183c76262a465da47 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Approved for entry into archive by Cláudia Bueno (claudiamoura18@gmail.com) on 2014-09-16T02:03:36Z (GMT) No. of bitstreams: 2 Dissertacao_2009_Joyce_Lobo.pdf: 1055257 bytes, checksum: c6fb4445c47b40e183c76262a465da47 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Made available in DSpace on 2014-09-16T02:03:36Z (GMT). No. of bitstreams: 2 Dissertacao_2009_Joyce_Lobo.pdf: 1055257 bytes, checksum: c6fb4445c47b40e183c76262a465da47 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) Previous issue date: 2009-12-09 / Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq / Fundação de Apoio à Pesquisa - FUNAPE / Curraleiro breed was formed in regime of extensive breeding on region of cerrado, with minimal attention to infectious diseases and alimentary, resulted in animals extremely rustic that composed an important genetic recourse for Brazilian livestock. In order to improve the understanding about immunological aspects this breed, a comparative study between Curraleiro and Nelore calves after immunization with BCG vaccine. Was realized the quantity of IgM and IgG antibodies specifics to Mycobacterium bovis, by indirect ELISA in house method. Was determined twelve young calves (six month of age) were used throughout the study. The animals were divided in two groups: six calves from Curraleiro breed and six calves from Nelore breed. Each group was further divided in: immunized group which received the BCG vaccine and a control which received the adjuvant. The data were submitted to descriptive statistics and then to the Kruskall Wallis and Mann-Whitney tests. It was realized hemogram, total protein, albumin, globulin eletroforesis of serological protein, ELISA for M. bovis IgG and IgM levels. The results were grouped and Curraleiro and Nelore calves were compared, the Curraleiro breed exhibited larger numbers of leucocytes, neutrophils, lymphocytes and monocytes; higher proteins and globulins levels; and higher concentration of alfa-1, beta and gama globins fraction. So, considered the vaccination to BCG, the Curraleiro calves were more levels in produce specifics M. bovis IgM and IgG. Between the immunized groups, Curraleiro group immunized presented better performance than Curraleiro control group, Nelore group immunized and lastly Nelore control group. Concluded that Curraleiro breed compared to Nelore breed exhibited unspecific and specific humoral immune response more productive qualified for bigger numbers of leucocytes and higher concentration of unspecific and specific immunoglobulin. / A raça Curraleiro foi formada em regime de criação extensiva na região do cerrado, com mínimos cuidados sanitários e de alimentação, resultando em animais rústicos, que constituem um importante recurso genético para a pecuária brasileira. Com o objetivo de ampliar os conhecimentos sobre aspectos imunológicos dessa raça, foi realizado o estudo comparativo entre bovinos da raça Curraleiro e Nelore após vacinação com Mycobacterium bovis - BCG. Para tanto se quantificou a produção de anticorpos IgM e IgG específicos para Mycobacterium bovis, por meio do teste de ELISA indireto método in house. Utilizou-se 12 bezerros de propriedades do Estado de Goiás, seis de cada raça com idade aproximada de seis meses. Os bezerros de cada raça foram subdivididos em outros dois grupos, o grupo vacinado recebeu Mycobacterium bovis BCG via intradermica. Inicialmente os dados foram submetidos à estatística descritiva e posteriormente aos testes de Kruskall Wallis e Mann- Whitney. Para o protocolo de avaliação realizaram-se os seguintes exames: hemograma, quantificação de proteína total, albumina, globulina, eletroforese das proteínas séricas, IgG e IgM M. bovis específicas. Agrupando os resultados de todas as colheitas, observou-se que os bezerros da raça Curraleiro quando comparados aos bezerros Nelore, apresentaram maiores contagem total de leucócitos, segmentados, linfócitos e monócitos; concentrações mais elevadas de proteínas e globulinas séricas; das frações alfa-1, beta e gama globulinas. Considerando especificamente a vacinação com Mycobacterium bovis - BCG, os bezerros Curraleiro produziram maiores quantidades de IgM e IgG M. bovis específicas quando comparados aos bezerros Nelore. Entre os grupos vacinados o que apresentou maiores valores foi o grupo Curraleiro vacinado, seguido pelo grupo Curraleiro controle, posteriormente grupo Nelore vacinado e por fim o grupo Nelore controle, com as menores concentrações. Conclui-se que bovinos da raça Curraleiro quando comparados aos da raça Nelore apresentam resposta imunológica inespecífica e específica humoral maiores, caracterizada por maior número de leucócitos e maiores concentrações de imunoglobulinas IgM e IgG M. bovis específicas.

Submitted by Cássio da Cruz Nogueira (cassionogueirakk@gmail.com) on 2017-05-05T15:51:42Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Tese_CaracterizacaoHistopatologicaImunohistoquimica.PDF: 2345314 bytes, checksum: c2fd5882b5a286836e6a66b1a85942b1 (MD5) / Approved for entry into archive by Edisangela Bastos (edisangela@ufpa.br) on 2017-05-10T16:04:21Z (GMT) No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Tese_CaracterizacaoHistopatologicaImunohistoquimica.PDF: 2345314 bytes, checksum: c2fd5882b5a286836e6a66b1a85942b1 (MD5) / Made available in DSpace on 2017-05-10T16:04:21Z (GMT). No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Tese_CaracterizacaoHistopatologicaImunohistoquimica.PDF: 2345314 bytes, checksum: c2fd5882b5a286836e6a66b1a85942b1 (MD5) Previous issue date: 2016-02-26 / A criação de búfalos é uma importante fonte de renda no Amapá, representando um importante setor na economia local. A tuberculose é uma enfermidade infecto-contagiosa de distribuição mundial, que ocorre em bovinos e bubalinos, causada predominantemente por Mycobacterium bovis. A doença tem caráter crônico debilitante com impacto econômico na produção de carne e leite em diversas regiões do mundo, além de ser uma importante zoonose. Objetivando caracterizar M. bovis em lesões sugestivas de tuberculose detectadas na inspeção de bubalinos no Estado do Amapá, através dos métodos histopatológicos e imunohistoquímicos (IHQ) e análise molecular, realizou-se a coleta de 109 amostras de lesões sugestivas de tuberculose. Para a análise histopatológica, empregou-se técnicas habituais para inclusão em parafina, pela coloração de hematoxilina e eosina, e Fite-Faraco. Para a IHQ utilizou-se o método da peroxidase-antiperoxidase (PAP) com um anti-soro policlonal de coelho contra o M. bovis (Dako B0124). Para a análise molecular, a extração do DNA micobacteriano, foi realizada diretamente do linfonodo e tratado pelo método do fenolclorofórmio, passando por dois protocolos de amplificação (PCR convencional e Nested- PCR). Histologicamente, 94,5% (103/109) apresentaram reação tecidual granulomatosa típica de lesão tuberculoide (LT), enquanto em 5,5% (06/109) sem características de granulomas tuberculoides (p < 0.0001). Os resultados obtidos através da IHQ, dentre os casos positivos pela histopatologia, todos apresentaram algum tipo de lesão classificada em diversos estágios pelo exame histopatológico, sendo observado que a maioria delas 82,2% (74/90; p < 0.0001) estava apenas no estágio IV. Entre os casos negativos, lesões necróticas apresentando-se apenas no último estágio de desenvolvimento (IV) também foram as mais frequentes 52,5% (10/19), e 31,5% (06/19) também foram negativos no histopatológico (p = 0.0030). Das 103 amostras positivas ao exame histopatológico, 73,8% (76/103) apresentaram reação de PCR positiva para o gênero Mycobacterium e 64,1% (66/103) apresentaram amplificação para a região RD4, confirmando a deleção, exclusiva da espécie M. bovis. Os resultados demonstraram que a tuberculose está presente nos rebanhos bubalinos do Amapá e regiões do Marajó no Pará, representando um sério risco de saúde pública. / The creation of buffalo is an important source of income in Amapá, an important sector in the local economy. Tuberculosis is an infectious disease of worldwide distribution, which occurs in cattle and buffaloes caused mainly by Mycobacterium bovis. The disease has debilitating chronic nature with economic impact on the production of meat and milk in different regions of the world, besides being an important zoonosis. Aiming to characterize M. bovis in suggestive of tuberculosis lesions detected in buffalo inspection in the State of Amapá, through histopathological and immunohistochemical methods (IHC) and molecular analysis, there was the collection of 109 samples suggestive of tuberculosis lesions. For histopathological analysis, we used standard techniques for paraffin by hematoxylin and eosin and Fite-Faraco. For IHC was used the method of peroxidase-antiperoxidase (PAP) with a polyclonal rabbit antiserum against M. bovis (Dako B0124). For molecular analysis, mycobacterial DNA extraction was directly performed lymph node and treated by the phenolchloroform method through two amplification protocols (conventional PCR and Nested- PCR). Histologically, 94.5% (103/109) had typical granulomatous tissue reaction tuberculoide injury (LT), while in 5.5% (06/109) without features of tuberculoid granulomas (p <0.0001). The results obtained by IHC among the positive cases by histopathology, all had some kind of injury classified in several stages by histopathology, and observed that most of them 82.2% (74/90; p <0.0001) was only stage IV. Among the negative cases, necrotic lesions presenting only the last stage of development (IV) were also frequently 52.5% (10/19) and 31.5% (06/19) were also negative in the histopathologic ( p = 0.0030). Of the 103 positive samples for histopathology, 73.8% (76/103) were PCR positive reaction to the genus Mycobacterium and 64.1% (66/103) had amplification for the RD4 region, confirming the deletion, exclusive of the species M. bovis. The results showed that tuberculosis is present in buffalo herds of Amapá and regions of Marajó in Pará, representing a serious risk to public health.