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Esparcia O.,Servei de Microbiologia | Esparcia O.,Autonomous University of Barcelona | Montemayor M.,Servei de Microbiologia | Ginovart G.,Servei de Pediatria | And 11 more authors.
Diagnostic Microbiology and Infectious Disease | Year: 2011

The diagnostic accuracy of a 16S ribosomal DNA (rDNA) gene-based molecular technique for bacterial meningitis (BM), early-onset neonatal sepsis (EONS), and spontaneous bacterial peritonitis (SBP) is evaluated. The molecular approach gave better results for BM diagnosis: sensitivity (S) was 90.6% compared to 78.1% for the bacterial culture. Percentages of cases correctly diagnosed (CCD) were 91.7% and 80.6%, respectively. For EONS diagnosis, S was 60.0% for the molecular approach and 70.0% for the bacterial culture; and CCD was 95.2% and 96.4%, respectively. For SPB diagnosis, the molecular approach gave notably poorer results than the bacterial cultures. S and CCD were 48.4% and 56.4% for the molecular approach and 80.6% and 89.1% for bacterial cultures. Nevertheless, bacterial DNA was detected in 53.3% of culture-negative samples. Accuracy of the 16S rDNA PCR approach differs depending on the sample, the microorganisms involved, the expected bacterial load, and the presence of bacterial DNA other than that from the pathogen implied in the infectious disease. © 2011 Elsevier Inc. Source

Prim N.,Servei de Microbiologia | Escamilla P.,Servei de Microbiologia | Sole R.,Servei de Microbiologia | Llovet T.,Servei de Microbiologia | And 4 more authors.
Diagnostic Microbiology and Infectious Disease | Year: 2012

Entamoeba histolytica antigen assays on stool are widely used to diagnose amebiasis. We report a case of confirmed amebic colitis with a false-negative antigen detection that became positive after treatment. Our results indicate that these assays may underdiagnose acute amebic infection when used alone and should be used cautiously. © 2012 Elsevier Inc. Source

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