Evaluation of buffy coat 16S rRNA PCR, buffy coat culture and whole blood PCR for detection of bacteraemia

• Main Authors: Valle, Demetrio L., Andrade, Jeannie I., Cabrera, Esperanza C., Rivera, Windell L.
• Format: text
• Published: Animo Repository 2010
• Subjects: Bacteremia; Blood—Examination; Leucocytes; Polymerase chain reaction; Biology
• Online Access: https://animorepository.dlsu.edu.ph/faculty_research/2099; https://animorepository.dlsu.edu.ph/context/faculty_research/article/3098/type/native/viewcontent
• Institution: De La Salle University

The use of Gram type-specific PCR on buffy coat from clinical specimens for the detection of bacteraemia was evaluated for the first time using whole blood culture as the gold standard. In addition, the established buffy coat culture and whole blood PCR were also compared. Gram-positive bacteria belonging to six species and Gramnegative bacteria from 10 species were isolated and identified by culture and detected using broad-range 16S rDNA primers and Gram-specific primers. Data from the three methods all conferred very high sensitivity, specificity, positive and negative predictive values when compared to whole blood culture. The Kappa coefficients of agreement were 0.9819 (buffy coat PCR), 0.9458 (whole blood PCR) and 1.0 (buffy coat culture), which establishes their validity as alternative methods to routine blood culture in detecting bacteraemia. In addition, results showed that there was a direct correlation of WBC counts greater than 12,000 cells per mm3 to the occurrence of bacteraemia as detected by the four methods (p < 0.05).