Molecular and Susceptibility Analysis of Toxigenic Clostridium difficile Obtained from Adult Patients Suspected of CDI in TrinidadReportar como inadecuado




Molecular and Susceptibility Analysis of Toxigenic Clostridium difficile Obtained from Adult Patients Suspected of CDI in Trinidad - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Clostridium difficile is a Gram positive rod-shaped bacterium that produces two major toxins, A and B. The detection of the organism and its toxins has been widely carried out using specialized Enzyme-Linked Immunosorbent Assay ELISA kits; however these generally have been unsuccessful in identifying all Clostridium difficile positive samples. In this study, fifteen clinically symptomatic patients from three of the five major regional hospitals in Trinidad were investigated for Clostridium difficile infections. Stool samples were assessed by ELISA and cultured isolates were characterized using agar dilution antibiotic sensitivity assays, conventional Polymerase Chain Reaction PCR, DNA sequencing and phylogenetic analysis of toxin A and B genes. All 15 patient stool samples and isolates were positive for toxigenic Clostridium difficile via ELISA and PCR respectively. All isolates were positive for the housekeeping tpi and Toxin B genes by PCR but only three of these were positive for the Toxin A gene. The Toxin B gene sequences showed 100% similarity levels among isolates while the Toxin A gene sequences showed 99% similarity among isolates. Phylogenetic analysis showed that the strains isolated in Trinidad most likely belonged to the same strain-group. Agar dilution sensitivity tests showed highest susceptibility to Pipercillin-Tazobactam and Meropenem 87% and the highest resistance was seen with Cefotaxime in 93%. These results indicate that similar virulent strains of C. difficile are present in the Trinidad population and that pathogenic strains are more likely to be susceptible to Pipercillin-Tazobactam and Meropenem.

KEYWORDS

Clostridium difficile Infection CDI, Toxigenic Clostridium difficile, Toxin A Gene, Toxin B Gene, Housekeeping Gene tpi, Antibiotic Susceptibility Testing, Phylogenetic, Sequencing

Cite this paper

Blake, L. , Akpaka, P. , Ramsubhag, A. and Hitlal-Blake, R. 2015 Molecular and Susceptibility Analysis of Toxigenic Clostridium difficile Obtained from Adult Patients Suspected of CDI in Trinidad. Open Journal of Medical Microbiology, 5, 43-57. doi: 10.4236-ojmm.2015.51006.





Autor: Lemar Wayne Blake1*, Patrick Eberechi Akpaka1, Adesh Ramsubhag2, Reneasha Kevi-Ann Steffi Hitlal-Blake3

Fuente: http://www.scirp.org/



DESCARGAR PDF




Documentos relacionados