Desenvolvimento de um ELISA indireto com antígenos recombinantes para detecção de anticorpos contra Mycoplasma hyopneumoniae

• Autor(a) principal: Brum, Clarice Brinck
• Data de Publicação: 2011
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFPel - Guaiaca
• Texto Completo: http://guaiaca.ufpel.edu.br/handle/123456789/1288
• topic: Mycoplasma hyopneumoniae; Enzootic pneumonia; ELISA; Diagnosis; Mycoplasma hyopneumoniae; CNPQ::CIENCIAS AGRARIAS::MEDICINA VETERINARIA

Mycoplasma hyopneumoniae is the etiological agent of swine enzootic pneumonia (EP), one of the most important respiratory diseases which affect swine worldwide. This disease is characterized by retarded development, especially in animals in the growing and finishing phase, causing significant economic losses in the herd. The presumptive diagnostic is based on clinical signs and lesions, however, laboratory tests are needed for a conclusive diagnosis of disease. Although the culture of the agent is considered the gold standard, it is not used routinely because of the slow growth of the bacterium and interference by other mycoplasmas. Therefore, there is a need for development of more sensitive and specific diagnostic methods for this disease. This study aimed the standardization and validation of an ELISA for detection of antibodies against M. hyopneumoniae. For this, six recombinant proteins of M. hyopneumoniae considered species-specific (P46, P95, P97 like, P102AB, Lppt and hypothetical protein 987) were evaluated. They were used as antigen for coating ELISA plates. Each of these proteins was confronted with three sets of pig serum. The sensitivity and specificity obtained for each protein were respectively: P95, 74.3% e 97.6%; P46, 53.7% e 97.6%; Lppt, 28.4% e 97.2%; 987, 27.1% e 96.1%; P102AB, 65.5% e 97.6%; P97 like, 72.6% e 97.2%. Using the set cut-off point, we calculated the positive predictive value, which ranged from 17.4% (for prevalence of 10%) to 99.4% (for prevalence of 90%), and negative predictive value which ranged from 34.5% to 99.5% depending on the prevalence of disease in a given area. These data show that the proteins P95, P46, P97 and P102AB like are potential targets to be use in diagnostic tests to detect antibodies against M. hyopneumoniae.