Isolation and identification of Mycobacterium bovis in cattle slaughtered from an abattoir in Garanhuns, Pernambuco / Isolamento e identificação de Mycobacterium bovis em bovinos abatidos em matadouro público de Garanhuns, Pernambunco

ABSTRACT

Tuberculosis is a chronic infectious disease caused by the Mycobacterium tuberculosis complex (CMT), members including M. bovis. The sanitary inspection in slaughterhouses has a great importance on public health for the removal of contaminated meat with pathological lesions. Cattle slaughtered in the abattoir of Garanhuns were subjected to macroscopic, histological, bacteriological, and molecular analyses. Lung inspection revealed gross lesions suggestive of tuberculosis. The characterization of tuberculous granulomas was performed by histopathology and hematoxylin and eosin (HE) staining. The identification of acid-fast bacilli (AFB) was performed on smears with fresh material and histological staining using Ziehl-Neelsen stain. Bacteriological diagnosis was carried out using Stonebrink and Lowenstein-Jensen media, and polymerase chain reaction (PCR) was performed from the DNA extracted from colonies for the identification of Mycobacterium spp. We found that 1% (32/3,.180) of the collected lungs showed lesions suggestive of tuberculosis. Histopathological analysis revealed that 65.62% (21/32) samples had granulomatous pneumonia. AFB was detected in 46.88% (15/32) smears and 4.16% (1/24) histological sections, as analyzed by Ziehl-Neelsen staining. Moreover, 68.75% (22/32) samples showed bacterial growth and molecular identification 90% (18/20) of the samples were positive...(AU)

RESUMO

A tuberculose é uma doença infecciosa crônica causada por membros do complexo Mycobacterium tuberculosis (CMT), incluindo M. bovis. A inspeção sanitária em matadouros frigoríficos possui grande importância para a saúde pública pela remoção de carne contaminada com lesões patológicas. Os bovinos abatidos no matadouro de Garanhuns-PE foram submetidos a análises macroscópicas, histológicas, bacteriológicas e moleculares. A inspeção pulmonar revelou lesões sugestivas de tuberculose.A caracterização de granulomas tuberculoides foi realizada através da histopatologia e coloração de hematoxilina e eosina (HE). A identificação de bacilo álcool - ácido resistente (BAAR) foi realizado em esfregaços com material fresco e em cortes histológicos sob a coloração de Zihel-Neelsen. O diagnóstico bacteriológico foi realizado em meio de cultivo Stonebrink e Lowenstein-Jensen e a reação em cadeia da polimerase (PCR) sucedeu a partir de DNA extraído de colônias para identificação do Mycobacterium sp... Verificou-se que1% (32/3.180) dos pulmões coletados apresentaram lesões sugestivas de tuberculose. Na análise histopatológica 65.62% (21/32) amostras tinham pneumonia granulomatosa. BAAR foram detectados em 46,88% (15/32) esfregaços e 4,16% (1/24) em corte histológico conforme analisado pela coloração de Ziehl-Neelsen. Além disso, em 68,75% (22/32) das amostras houve crescimento bacteriano e na...(AU)