Detalhes bibliográficos
| Ano de defesa: |
2011 |
| Autor(a) principal: |
BARROS, Mércia Rodrigues
 |
| Orientador(a): |
MOTA, Rinaldo Aparecido |
| Banca de defesa: |
SAUKAS, Tomoe Noda,
NASCIMENTO, Elmiro Rosendo do,
SILVEIRA, Wanderley Dias da,
COSTA, Mateus Matiuzzi da |
| Tipo de documento: |
Tese
|
| Tipo de acesso: |
Acesso aberto |
| Idioma: |
por |
| Instituição de defesa: |
Universidade Federal Rural de Pernambuco
|
| Programa de Pós-Graduação: |
Programa de Pós-Graduação em Ciência Veterinária
|
| Departamento: |
Departamento de Medicina Veterinária
|
| País: |
Brasil
|
| Palavras-chave em Português: |
|
| Palavras-chave em Inglês: |
|
| Área do conhecimento CNPq: |
|
| Link de acesso: |
http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/5768
|
Resumo: |
This investigation had the objective of studying the molecular epidemiology of infections by Mycoplasma spp., Escherichia coli and Staphylococcus spp., in broilers and commercial layers of the state of Pernambuco. A hundred and twenty birds were used from 24 flock of which 55 healthy broilers, 35 broilers and 30 commercial layers with respiratory and digestive signs. For the study of Mycoplasma spp., the bacteriological exam, the Polymerase Chain Reaction (PCR) and Nested-PCR were used. For the isolation of Escherichia coli the medium Eosine Methylene Blue Agar (EMB) was used. The pathogenicity test in vitro was carried out in Congo Red magnesium oxalate agar while the PCR was used, to evaluate the presence of virulence genes and the phylogenetic determination of groups A, B1, B2 and D. For the study of citotoxicity, the samples were inoculated in Vero cells. For the detection of plasmids, the extraction of DNA and the visualization of the plasmid profile was used. For Staphylococcus spp., isolation the bacteriological exam was used, with biochemical proof of species identification. The formation of the biofilm Congo Red Agar (ACR), and the detection of the mecA gene by PCR were verified. For Escherichia coli and Staphylococcus spp., a resistance profile was carried out through tests of disc diffusion and Minimum Inhibitory Concentration (MIC). In the PCR for Mycoplasma spp., it was observed that seven (29.17%) samples were positive for MS and one (4.17%) for MG, in samples of birds with respiratory signs, the positive sample was further confirmed as vacinal strain MG-F; in the bacteriological exam all samples were negative. From the 35 isolated Escherichia coli submitted to PCR, the number of positive E coli isolates for virulence genes of were: iss (16), iutA (10), hlyF (17), ironN (11), ompT (16), crl (10), fimA (14), tsh (5), papA (2), csgA (0) and iucA (2). They were phylogenetically classified into groups A (71.42%) and B1 (28.58%). The presence of hemolysis in agar blood was superior to the detection of the hlyF gene by the PCR. The pathogenicity test in Congo Red agar showed five (14.29%) positive isolated E coli, and for the cytotoxicity evaluation in vitro, in Vero cells, all the isolated E coli were negative. On the resistance profile to antibiomicrobials, it was observed that 33 (94.28%) of the E coli isolates were resistant to three or more antibiotics and that lincomicine presented the highest percentage of resistance (100%). On the CIM, multiresistance to various antimircrobials was observed. With respect to the plasmids, a frequency of 80.0% (28/35) was observed in E. coli isolates, where 16 E. coli isolates presented plasmid of 88 MDa. From the 24 processed samples 16 Staphylococcus isolates were, five being coagulasis-positive (SCP) and 11 coagulasis-negative (SCN). The biofilm production test, six (37.5%) isolates were positive. Regarding PCR for the detection of the mecA gene, all the isolates were negative. It was observed that 15 isolates presented a multiresistance profile to antimicrobials. Based on the results, these bacteria participate in the respiratory disease of the studied chickens populations and they must be considered in the control and treatment measures used in aviculture, together with the performance of in vitro tests. |
