| Revue: | Boletín médico del Hospital Infantil de México |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000378732 |
| ISSN: | 1665-1146 |
| Autores: | Cruz Córdova, Ariadnna1 Esteban Kenel, Verónica1 Espinosa Mazariego, Karina1 Ochoa, Sara A1 Moreno Espinosa, Sarbelio2 Garza Elhainb, Alicia de la2 Fernández Rendón, Elizabeth3 López Villegas, Edgar Oliver3 Xicohtencatl Cortes, Juan1 |
| Instituciones: | 1Hospital Infantil de México "Federico Gómez", Laboratorio de Bacteriología Intestinal, México, Distrito Federal. México 2Hospital Infantil de México "Federico Gómez", Departamento de Infectología, México, Distrito Federal. México 3Instituto Politécnico Nacional, Escuela Nacional de Ciencias Biológicas, México, Distrito Federal. México |
| Año: | 2014 |
| Periodo: | Ene-Feb |
| Volumen: | 71 |
| Número: | 1 |
| Paginación: | 15-24 |
| País: | México |
| Idioma: | Inglés |
| Tipo de documento: | Artículo |
| Enfoque: | Aplicado, analítico |
| Resumen en inglés | Klebsiella pneumoniae is considered an opportunistic pathogen associated with nosocomial infections occurring mainly in pediatric patients, such as premature infants placed in intensive care units. The aim of this study was to characterize K. pneumoniae strains isolated from different clinical sources based on their resistance to antibiotics and the presence of virulence factors associated with their persistence in the hospital environment. Methods: Fifty clinical strains of K. pneumoniae isolated from urine, blood, catheters, and cerebrospinal fluid sources were characterized. Susceptibility testing of antibiotics was performed by the Kirby-Bauer method (Clinical Laboratory Standards Institute, 2010). The ability to form a biofilm was determined by the 96-well microplate method. Capsule and fimbrial structures were visualized by transmission electron microscopy (TEM). Adherence was evaluated on A549 and HT29 cells. Assessment for the presence and expression of the ecpA, fimH, and mrkA genes was performed by PCR and RT-PCR. Results: Clinical strains of K. pneumoniae were isolated from 48% of urine, 24% of blood, 18% of catheters, and 10% of cerebrospinal fluid. Ninety-two percent of the strains showed resistance to cefpodoxime, whereas few strains showed resistance to imipenem and meropenem (4 and 2%, respectively). The extended spectrum-type beta-lactamase (ESBL) phenotype was identified in 97% of the strains positive for resistance to third-generation cephalosporins. In addition, 88% of the strains were multidrug resistant. All strains were able to form biofilms. Capsule and fimbirial structures were visualized by TEM. Based on our adhesion assays, the A549 cell line was more permissive to K. pneumoniae strains than the HT-29 cell line. K. pneumoniae strains amplified and expressed ecpA (100/70%), fimH (98/2%), and mrkA (84/48%) genes, respectively. Conclusion: The K. pneumoniae strains exhibited features that allo |
| Disciplinas: | Medicina |
| Palabras clave: | Hospitales, Microbiología, Klebsiella pneumoniae, Resistencia multifármacos, Biopelículas, Factor de colonización, Infección hospitalaria |
| Keyword: | Medicine, Hospitals, Microbiology, Klebsiella pneumoniae, Multidrug resistance, Biofilms, Colonization factor, Nosocomial infections |
| Texte intégral: | Texto completo (Ver HTML) |
