ArticlePathogens (Basel, Switzerland)2022
Serotype Distribution, Virulence Determinants and Antimicrobial Susceptibility of Streptococcus agalactiae Isolated from Young Infants
Article in Pathogens (Basel, Switzerland), 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 11 papers.
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11 citing papers in PubMed, 13 citations in OpenAlex.
- Gene Factors and Serotypes Related to Polysaccharide and Protein-Based Candidate Vaccines AmongCurrent issues in molecular biology · 2026Article
- Capsular Typing and Molecular Characterization of Streptococcus agalactiae Strains Isolated From Bovine Mastitis in Iran.Veterinary medicine and science · 2025Article
- Molecular epidemiology and antibiotic resistance of group BFrontiers in cellular and infection microbiology · 2025Article
- Virulence Gene Profiling and Molecular Typing of Clinical Isolates ofInfection and drug resistance · 2025Article
- Antibiotic Resistance and Serotypes Distribution inPolish journal of microbiology · 2024Article
- Molecular evidence that GBS early neonatal sepsis results from ascending infection: comparative hybrid genomics analyses show that microorganisms in the vaginal ecosystem, amniotic fluid, chorioamniotic membranes, and neonatal blood are the same.Journal of perinatal medicine · 2024Article
- Performance Evaluation of NovaplexMicroorganisms · 2024Article
- Group B Streptococcus Infections in Non-Pregnant Adults, Italy, 2015-2019.Pathogens (Basel, Switzerland) · 2024Article
- Emergence of High-Level Gentamicin Resistance inAntibiotics (Basel, Switzerland) · 2024Article
- A Review of the Impact of Streptococcal Infections and Antimicrobial Resistance on Human Health.Antibiotics (Basel, Switzerland) · 2024Review
- Genomic insights into the diversity, virulence, and antimicrobial resistance of group BFrontiers in cellular and infection microbiology · 2024Article
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9 authors at 3 institutions in 2 countries.
Funding
Abstract
Background: Streptococcus agalactiae (Group B Streptococcus, GBS) is the most common cause of serious infections in the first 3 months of life worldwide. The pathogenicity of GBS is closely related to serotypes, surface proteins and virulence factors, and the distribution of them may vary temporally and geographically. However, data related to GBS surface proteins and virulence determinants in China are very few. The aim of this study is to investigate the genetic characteristics of clinical GBS isolates from infected infants. Methods: We recovered GBS isolates from infected infants younger than 3 months during 2017−2021 at Maternal and Child Health Hospital of Hubei Province in China. We assessed the GBS serotypes, surface proteins, virulence determinants and antibiotic resistance genes distribution, by Multilocus sequence typing (MLST) and whole-genome sequencing analysis. Results: Among 97 isolates (81 EOD and 16 LOD), 5 serotypes were detected. Serotype III was the most represented (49.5%), followed by type Ib (20.6%). The isolates belonged to 17 different sequence types (STs) that grouped into the 8 clonal complexes (CCs). The most frequently identified ST was ST17 (23.7%). The most predominant surface protein of alpha-protein-like (alp) family (one of the protein components of the GBS surface antigen, resistant to trypsin) present was Rib (41.2%), which was mainly detected in serotype III. The srr1, which encodes Srr1 protein, was identified in 54.6% of isolates. The hvgA encoding for hypervirulent GBS adhesin can be detected in all 24 serotype III GBS. Among the pilus islands genes, 50% and 58.8% of the isolates were positive for pi-1 and pi-2a genes, respectively. The presence of pi-2b was mainly associated with serotype III/CC17 strains; 56.7% of isolates carried tetM, tetO/tetL, ermB antibiotic resistant genes. Among all the virulence genes detected, the cfb-cylE-lmb-pavA pattern was the main virulence gene profile (81.4%), mainly in serotype III/CC17. Conclusions: The whole genomic sequencing data revealed the high variation in surface proteins, determining virulence and antibiotic resistance in clinical isolates from 97 GBS infected infants. These data provide insightful characteristics of genetic features of GBS. Constant epidemiological surveillance is warranted to provide information on the GBS pathogenic dynamics and antibiotic resistance profiles in the surveyed areas for improving therapeutic outcomes.
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