title: Development of a new pentaplex real-time PCR assay for the identification of poly-microbial specimens containing Staphylococcus aureus and other staphylococci, with simultaneous detection of staphylococcal virulence and methicillin resistance markers.
abstract: Staphylococcus aureus strains harbouring genes encoding virulence and antibiotic resistance are of public health importance. In clinical samples, pathogenic S. aureus is often mixed with putatively less pathogenic coagulase-negative staphylococci (CoNS), both of which can harbour mecA, the gene encoding staphylococcal methicillin-resistance. There have been previous attempts at distinguishing MRSA from MRCoNS, most of which were based on the detection of one of the pathognomonic markers of S. aureus, such as coa, nuc or spa. That approach might suffice for discrete colonies and mono-microbial samples; it is inadequate for identification of clinical specimens containing mixtures of S. aureus and CoNS. In the present study, a real-time pentaplex PCR assay has been developed which simultaneously detects markers for bacteria (16S rRNA), coagulase-negative staphylococcus (cns), S. aureus (spa), Panton-Valentine leukocidin (pvl) and methicillin resistance (mecA). Staphylococcal and non-staphylococcal bacterial strains (n = 283) were used to validate the new assay. The applicability of this test to clinical samples was evaluated using spiked blood cultures (n = 43) containing S. aureus and CoNS in mono-microbial and poly-microbial models, which showed that the 5 markers were all detected as expected. Cycling completes within 1 h, delivering 100% specificity, NPV and PPV with a detection limit of 1.0 × 10(1) to 3.0 × 10(1) colony forming units (CFU)/ml, suggesting direct applicability in routine diagnostic microbiology. This is the most multiplexed real-time PCR-based PVL-MRSA assay and the first detection of a unique marker for CoNS without recourse to the conventional elimination approach. There was no evidence that this new assay produced invalid/indeterminate test results.
authors: Centre for Healthcare Associated Infections, Centre for Biomolecular Sciences Building, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom. Electronic address: okolie.charles@lmu.edu.ng.
authors: Charles E
authors: CE
authors: Okolie
authors: Centre for Healthcare Associated Infections, Centre for Biomolecular Sciences Building, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom.
authors: Karl G
authors: KG
authors: Wooldridge
authors: Centre for Healthcare Associated Infections, Centre for Biomolecular Sciences Building, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom.
authors: David P
authors: DP
authors: Turner
authors: Centre for Healthcare Associated Infections, Centre for Biomolecular Sciences Building, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom.
authors: Alan
authors: A
authors: Cockayne
authors: Centre for Healthcare Associated Infections, Centre for Biomolecular Sciences Building, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom.
authors: Richard
authors: R
authors: James
mesh_terms: D001426:Bacterial Proteins / Q000235:genetics; D054316:Biomarkers, Pharmacological / Q000097:blood / Q000737:chemistry; D003030:Coagulase / Q000032:analysis; D006801:Humans; D055624:Methicillin-Resistant Staphylococcus aureus / Q000235:genetics / Q000302:isolation & purification*; D060885:Multiplex Polymerase Chain Reaction / Q000379:methods*; D046915:Penicillin-Binding Proteins; D011110:Polymorphism, Genetic; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D060888:Real-Time Polymerase Chain Reaction / Q000379:methods*; D013203:Staphylococcal Infections / Q000382:microbiology*; D013210:Staphylococcus / Q000145:classification* / Q000201:enzymology / Q000302:isolation & purification* / Q000472:pathogenicity; D014774:Virulence
chemical_list: D001426:Bacterial Proteins; D054316:Biomarkers, Pharmacological; D003030:Coagulase; D046915:Penicillin-Binding Proteins; D012336:RNA, Ribosomal, 16S; C487789:mecA protein, Staphylococcus aureus
keywords: Differential diagnosis; PVL; Poly-microbial infections; Staphylococci