ArticlePloS one2013
Superiority of trans-oral over trans-nasal sampling in detecting Streptococcus pneumoniae colonization in adults.
Article in PloS one, 2013. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 66 papers, 1 of them a synthesis that pooled it.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
66 citing papers in PubMed, 1 synthesis or guideline pooled it, 127 citations in OpenAlex.
- Pooled it
- 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
- Prevalence, Serotype Distribution, and Risk Factors Associated WithOpen forum infectious diseases · 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
- Digital PCR linkage analysis resolvesMicrobiology spectrum · 2026Article
- Kinetic profile and mucosal capsular polysaccharide IgG responses to serotype 3 pneumococcus in the adult oropharynx following an experimental human challenge.Frontiers in microbiology · 2026Article
- Hidden burden of pneumococcal colonization in adults with viral respiratory infections: the role of influenza and RSV.Frontiers in cellular and infection microbiology · 2026Article
- Article
- Duplex ddPCR detection of lytA and piaB in Streptococcus pneumoniae from nasopharyngeal swabs.Scientific reports · 2025Article
- Storage stability of non-encapsulated pneumococci in saliva is dependent on null-capsule clade, with strains carryingMicrobiology (Reading, England) · 2025Article
- Observational
- Persistence of Vaccine Serotype Carriage and Differences in Pneumococcal Carriage by Laboratory Method and Sample Type in Indigenous Individuals in the Southwest United States.The Journal of infectious diseases · 2025Observational
- Temporal changes in pneumococcal carriage among childcare-attending children during the COVID-19 pandemic in the Greater New Haven Area, USA.Research square · 2025Article
- Utilizing large and diverse bacterial genome datasets to improve the detection and identification ofMicrobial genomics · 2025Article
- Temporal changes in pneumococcal carriage among childcare-attending children during the COVID-19 pandemic in the Greater New Haven Area, USA.medRxiv : the preprint server for health sciences · 2025Article
- An abundance ofMicrobiology (Reading, England) · 2025Article
- Detection of Pneumococcal Carriage in Asymptomatic Healthcare Workers.Open forum infectious diseases · 2025Article
- Article
- Longitudinal prevalence and co-carriage of pathogens associated with nursing home acquired pneumonia in three long-term care facilities.PLOS global public health · 2025Article
- A decade of 10-valent pneumococcal conjugate vaccine use in Lithuania: trends in invasive pneumococcal serotype dynamics.Frontiers in public health · 2025Article
6 more citing papers are in PubMed but not listed here.
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
9 authors at 3 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The human nasopharynx is the main reservoir for Streptococcus pneumoniae. We applied conventional and molecular methods to determine the prevalence of S. pneumoniae nasopharyngeal colonization in adults. Paired trans-orally and trans-nasally obtained nasopharyngeal samples from 268 parents of 24-month-old children were assessed for pneumococcal presence. Parents were classified as colonized when live pneumococci were recovered from either sample cultured on medium selective for S. pneumoniae. Of the 52 (19%) colonized parents 49 (18%) were culture-positive in trans-nasal and 10 (4%) in trans-oral samples. Bacterial growth was harvested from these cultures, DNA isolated and tested by quantitative-PCR (qPCR) targeting lytA and piaA genes specific for S. pneumoniae. A sample was considered positive if signals for both genes were detected. Altogether 105 (39%) individuals were classified as positive for pneumococcus by qPCR including 50 (19%) in trans-nasal and 94 (35%) in trans-oral settings. Although significantly more trans-nasal compared to trans-oral samples were culture-positive for S. pneumoniae at the primary diagnostic step (p<0.001) the opposite was observed in qPCR results (p<0.001). To confirm the presence of live pneumococcus in samples positive by qPCR but negative at the initial diagnostic step, we serially-diluted cell harvests, re-cultured and carefully examined for S. pneumoniae presence. Live pneumococci were recovered from an additional 43 parents including 42 positive in trans-oral and 4 in trans-nasal samples increasing the number of individuals culture- and qPCR-positive to 93 (35%) and positive by either of two methods to 107 (40%). There were significantly more trans-oral than trans-nasal samples positive for pneumococcus by both culture and qPCR (n = 71; 27%; vs. n = 50; 19%; p<0.05). Our data suggest that pneumococcal colonization is more common in adults than previously estimated and point towards the superiority of a trans-oral over a trans-nasal approach when testing adults for colonization with S. pneumoniae.
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