ArticleJournal of clinical microbiology2007
Serotype IX, a Proposed New Streptococcus agalactiae Serotype.
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 118 papers, 1 of them a synthesis that pooled it.
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The trial behind it
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
118 citing papers in PubMed, 1 synthesis or guideline pooled it.
- Maternal Colonization With Group B Streptococcus and Serotype Distribution Worldwide: Systematic Review and Meta-analyses.Clinical infectious diseases : an official publication of the Infectious Diseases Society of America · 2017Pooled it
- Increasing Antimicrobial Resistance Profile Diversity of Colonizing Group BAnnals of laboratory medicine · 2026Article
- Prevalence, Serotype Distribution, and Antimicrobial Resistance ofJournal of clinical medicine · 2026Article
- Emergence, identification, and characterization of a novel Streptococcus agalactiae CPS type Ia ST7 strain (Ia-2021) causing large scale mortalities in tilapia aquaculture.Scientific reports · 2026Article
- A murine model of adult gastrointestinal colonization by Group BInfection and immunity · 2026Article
- Expansion of host range for Streptococcus agalactiae: first case in hybrid marbled goby (Oxyeleotris marmoratus ♀ × Oxyeleotris lineolatus ♂) from aquaculture.Veterinary research communications · 2026Article
- Zoonotic Approach toInternational journal of microbiology · 2026Article
- Towards a holistic epidemiology ofFrontiers in bioinformatics · 2026Article
- New Strategies for Preventing Perinatal Group B Streptococcus (GBS) Infections.Pathogens (Basel, Switzerland) · 2025Review
- Protective Effect of Nanobodies Targeting Sip Protein AgainstAnimals : an open access journal from MDPI · 2025Article
- A murine model of adult gastrointestinal colonization by Group BbioRxiv : the preprint server for biology · 2025Article
- Genetic diversity of Streptococcus agalactiae from dairy cattle with mastitis in Argentina.BMC veterinary research · 2025Article
- Serotype Distribution, Virulence, and Antibiotic Resistance Genomic Characterization of Group B Streptococcus - China, 1998-2024.China CDC weekly · 2025Article
- Article
- Molecular epidemiology and antibiotic resistance of group BFrontiers in cellular and infection microbiology · 2025Article
- A Comparative Analysis of Molecular Epidemiology and Antibiotic Resistance in Group B Streptococcus Isolated From Invasive and Noninvasive Adult Cases in Daejeon, South Korea.The Canadian journal of infectious diseases & medical microbiology = Journal canadien des maladies infectieuses et de la microbiologie medicale · 2025Article
- Serotype distribution and clinical characteristics of Group B Streptococcus Bacteremia in nonpregnant adults: a 15-Year Multicenter Study in Korea.BMC infectious diseases · 2024Article
- Review
- Group B Streptococcus Infections in Non-Pregnant Adults, Italy, 2015-2019.Pathogens (Basel, Switzerland) · 2024Article
- Re-framing the importance of Group BInfection and immunity · 2024Review
58 more citing papers are in PubMed but not listed here.
Corrections and comments
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Authors and funding
5 authors.
Funding
Abstract
We identified three isolates of Streptococcus agalactiae (group B streptococcus [GBS]), of human origin, which failed to react with antisera against any of the nine known GBS serotypes. Polyclonal rabbit antisera raised against these isolates and standard GBS typing sera were used in capillary precipitation and Ouchterlony tests to compare the strains with known GBS serotype reference strains. All three previously nontypeable isolates reacted with all three new antisera, producing lines of identity in the Ouchterlony test. Weak cross-reactions with antisera against several GBS serotypes were observed but were removed by absorption with corresponding antigens. The new antisera were used to test 227 GBS isolates that had been nontypeable or difficult to type using standard antisera. Of these, five reacted with the new antisera. These results suggested that all eight isolates belong to the previously unrecognized GBS serotype. They were tested by Western blotting for the Calpha and Cbeta proteins and by PCR to identify molecular serotypes and surface protein antigen genes. Two segments of the cps gene cluster (3' end of cpsE-cpsF and 5' end of cpsG, approximately 700 bp; 3' end of cpsH and 5' end of cpsM, approximately 560 bp) were sequenced. All eight isolates expressed Calpha, and seven expressing the Cbeta protein and the corresponding genes, bca and bac, respectively, were identified. They all share the same, unique partial cps sequence. These results indicate that these eight isolates represent a new S. agalactiae serotype, which we propose should be designated serotype IX.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.