ArticleJournal of clinical microbiology2007
Evaluation and improvement of real-time PCR assays targeting lytA, ply, and psaA genes for detection of pneumococcal DNA.
Article in Journal of clinical microbiology, 2007. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 334 papers.
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Who cites it
334 citing papers in PubMed, 597 citations in OpenAlex.
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- Effect of a Reduced PCV10 Dose Schedule on Pneumococcal Carriage in Vietnam.The New England journal of medicine · 2024Trial
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- An emm-type specific qPCR to track bacterial load during experimental human Streptococcus pyogenes pharyngitis.BMC infectious diseases · 2021Trial
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- Streptococcus pneumoniae carriage and antibiotic susceptibility among Indonesian pilgrims during the Hajj pilgrimage in 2015.PloS one · 2021Trial
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- Bacteria from bronchoalveolar lavage fluid from children with suspected chronic lower respiratory tract infection: results from a multi-center, cross-sectional study in Spain.European journal of pediatrics · 2018Trial
- Diagnosis of pneumococcal pneumonia using quantitative PCR targeting lytA and piaB in adult patients with community-acquired pneumonia.European journal of clinical microbiology & infectious diseases : official publication of the European Society of Clinical Microbiology · 2026Article
- Bacterial Meningitis Epidemiology in Burkina Faso and Niger-High-Risk Countries in the Meningitis Belt of Sub-Saharan Africa, 2015-2023.The Journal of infectious diseases · 2026Article
- Nasopharyngeal microbiota profiles and lytA-PCR status in adult pneumococcal pneumonia: distinct microbial communities and diagnostic implications.Pneumonia (Nathan Qld.) · 2026Article
- Microbial Detection in Community-Acquired Pleural Space Infections Using the BIOFIRE Joint Infection Panel and Individual Polymerase Chain Reaction Assays.Clinical infectious diseases : an official publication of the Infectious Diseases Society of America · 2026Article
- Pneumococcal colonization in pediatric patients undergoing hematopoietic cell transplantation.Microbiology spectrum · 2026Article
- Characteristics of Streptococcus pneumoniae colonising Cypriot children during a period of high PCV10 and PCV13 vaccine coverage: serotypes and antimicrobial resistance.BMC infectious diseases · 2026Article
- Pneumococcal meningitis among hospitalised children after introduction of pneumococcal conjugate vaccine in India: a sentinel hospital surveillance (2019-2022).The Lancet regional health. Southeast Asia · 2026Article
- Epidemiological, immunological and virulence characteristics of persistent Streptococcus pneumoniae vaccine serotypes following vaccine introduction.Nature communications · 2026Article
- Genomic and phenotypic characterization of a multidrug-resistant Streptococcus pneumoniae 19 F ST320 isolate from a pediatric SARS-CoV-2 case in Yogyakarta, Indonesia.Scientific reports · 2026Article
- Digital PCR linkage analysis resolvesMicrobiology spectrum · 2026Article
274 more citing papers are in PubMed but not listed here.
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Authors and funding
14 authors at 3 institutions in 3 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The accurate diagnosis of pneumococcal disease has frequently been hampered not only by the difficulties in obtaining isolates of the organism from patient specimens but also by the misidentification of pneumococcus-like viridans group streptococci (P-LVS) as Streptococcus pneumoniae. This is especially critical when the specimen comes from the respiratory tract. In this study, three novel real-time PCR assays designed for the detection of specific sequence regions of the lytA, ply, and psaA genes were developed (lytA-CDC, ply-CDC, and psaA, respectively). These assays showed high sensitivity (<10 copies for lytA-CDC and ply-CDC and an approximately twofold less sensitivity for psaA). Two additional real-time PCR assays for lytA and ply described previously for pneumococcal DNA detection were also evaluated. A panel of isolates consisting of 67 S. pneumoniae isolates (44 different serotypes and 3 nonencapsulated S. pneumoniae isolates from conjunctivitis outbreaks) and 104 nonpneumococcal isolates was used. The 67 S. pneumoniae isolates were reactive in all five assays. The new real-time detection assays targeting the lytA and psaA genes were the most specific for the detection of isolates confirmed to be S. pneumoniae, with lytA-CDC showing the greatest specificity. Both ply PCRs were positive for all isolates of S. pseudopneumoniae, along with 13 other isolates of other P-LVS isolates confirmed to be non-S. pneumoniae by DNA-DNA reassociation. Thus, the use of the ply gene for the detection of pneumococci can lead to false-positive reactions in the presence of P-LVS. The five assays were applied to 15 culture-positive cerebrospinal fluid specimens with 100% sensitivity; and serum and ear fluid specimens were also evaluated. Both the lytA-CDC and psaA assays, particularly the lytA-CDC assay, have improved specificities compared with those of currently available assays and should therefore be considered the assays of choice for the detection of pneumococcal DNA, particularly when upper respiratory P-LVS might be present in the clinical specimen.
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