ArticlePloS one2014
Population-based analysis of invasive nontypeable pneumococci reveals that most have defective capsule synthesis genes.
Article in PloS one, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 39 papers.
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Who cites it
39 citing papers in PubMed.
- Clonal expansion of global pneumococcal sequence cluster 3 within serotype 8 after 13-valent pneumococcal conjugate vaccine introduction, South Africa.Microbial genomics · 2026Article
- Accurate serotype identification ofJournal of clinical microbiology · 2026Article
- Serotype distribution among adults with community-acquired pneumococcal pneumonia in Japan between 2019 and 2022: A multicenter observational study.Human vaccines & immunotherapeutics · 2025Observational
- Storage stability of non-encapsulated pneumococci in saliva is dependent on null-capsule clade, with strains carryingMicrobiology (Reading, England) · 2025Article
- An abundance ofMicrobiology (Reading, England) · 2025Article
- Update on the evolving landscape of pneumococcal capsule types: new discoveries and way forward.Clinical microbiology reviews · 2025Review
- AliC and AliD of nonencapsulatedFrontiers in cellular and infection microbiology · 2025Article
- Emerging vaccine strategies against the incessant pneumococcal disease.NPJ vaccines · 2023Review
- Article
- Pneumococcal concentration and serotype distribution in preschool children with radiologically confirmed pneumonia compared to healthy controls prior to introduction of pneumococcal vaccination in Zanzibar: an observational study.BMC infectious diseases · 2022Observational
- Endocarditis Caused by Nontypeable Streptococcus pneumoniae.Clinical infectious diseases : an official publication of the Infectious Diseases Society of America · 2022Article
- Identification and molecular epidemiology of routinely determined Streptococcus pneumoniae with negative Quellung reaction results.Journal of clinical laboratory analysis · 2022Article
- A Novel Pneumococcal Surface Protein K of NonencapsulatedInfection and immunity · 2022Article
- Pneumococcal Surface Proteins as Virulence Factors, Immunogens, and Conserved Vaccine Targets.Frontiers in cellular and infection microbiology · 2022Review
- Review
- Transformation of nonencapsulated Streptococcus pneumoniae during systemic infection.Scientific reports · 2020Article
- The Best of All Worlds:Microorganisms · 2019Review
- Genomic differences among carriage and invasive nontypeable pneumococci circulating in South Africa.Microbial genomics · 2019Article
- Selective pressure: Rise of the nonencapsulated pneumococcus.PLoS pathogens · 2019Article
- Persistence of Nasopharyngeal Pneumococcal Vaccine Serotypes and Increase of Nonvaccine Serotypes Among Vaccinated Infants and Their Mothers 5 Years After Introduction of Pneumococcal Conjugate Vaccine 13 in The Gambia.Clinical infectious diseases : an official publication of the Infectious Diseases Society of America · 2019Article
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5 authors.
Funding
Abstract
Since nasopharyngeal carriage of pneumococcus precedes invasive pneumococcal disease, characteristics of carriage isolates could be incorrectly assumed to reflect those of invasive isolates. While most pneumococci express a capsular polysaccharide, nontypeable pneumococci are sometimes isolated. Carriage nontypeables tend to encode novel surface proteins in place of a capsular polysaccharide synthetic locus, the cps locus. In contrast, capsular polysaccharide is believed to be indispensable for invasive pneumococcal disease, and nontypeables from population-based invasive pneumococcal disease surveillance have not been extensively characterized. We received 14,328 invasive pneumococcal isolates through the Active Bacterial Core surveillance program during 2006-2009. Isolates that were nontypeable by Quellung serotyping were characterized by PCR serotyping, sequence analyses of the cps locus, and multilocus sequence typing. Eighty-eight isolates were Quellung-nontypeable (0.61%). Of these, 79 (89.8%) contained cps loci. Twenty-two nontypeables exhibited serotype 8 cps loci with defects, primarily within wchA. Six of the remaining nine isolates contained previously-described aliB homologs in place of cps loci. Multilocus sequence typing revealed that most nontypeables that lacked capsular biosynthetic genes were related to established non-encapsulated lineages. Thus, invasive pneumococcal disease caused by nontypeable pneumococcus remains rare in the United States, and while carriage nontypeables lacking cps loci are frequently isolated, such nontypeable are extremely rare in invasive pneumococcal disease. Most invasive nontypeable pneumococci possess defective cps locus genes, with an over-representation of defective serotype 8 cps variants.
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