ArticleThe Journal of infectious diseases2025
Molecular Epidemiology of Invasive Group B Streptococcus in South Africa, 2019-2020.
Article in The Journal of infectious diseases, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
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Who cites it
6 citing papers in PubMed.
- Gestational age modifies associations between Group B Streptococcus genomic characteristics and postnatal age at disease onset.Nature communications · 2026Article
- Bacterial targeting of the neutrophil inhibitory receptor LILRB3 to evade antibody immunity.Nature communications · 2026Article
- Penicillin-Binding Proteins inAntibiotics (Basel, Switzerland) · 2026Review
- A large prospective study of group B Streptococcus carriage in pregnant women in Morocco: prevalence, serotype distribution, antimicrobial resistance and virulence determinants.BMC infectious diseases · 2025Article
- Prevalence and genetic characteristics of lincosamide resistance genesMicrobial genomics · 2025Article
- Retropharyngeal abscess caused byIDCases · 2025Article
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16 authors.
Funding
Abstract
backgroundGroup B Streptococcus (GBS) is a leading cause of neonatal meningitis and sepsis and an important cause of disease in adults. Capsular polysaccharide and protein-based GBS vaccines are currently under development.
methodsThrough national laboratory-based surveillance, invasive GBS isolates were collected from patients of all ages between 2019 and 2020. Phenotypic serotyping and antimicrobial susceptibility testing were conducted, followed by whole-genome sequencing for analysis of population structure and surface protein and resistance genes.
resultsIn total, 1748 invasive GBS cases were reported. Of these, 661 isolates underwent characterization, with 658 yielding both phenotypic and genotypic results. Isolates (n = 658) belonged to 5 clonal complexes (CC1, CC8/10, CC17, CC19, and CC23) and 6 serotypes were detected: III (42.8%), Ia (27.9%), V (11.9%), II (8.4%), Ib (6.7%), and IV (2.3%). Phenotypically, only 1 isolate exhibited reduced penicillin susceptibility (minimum inhibitory concentration 0.25 µg/mL). Phenotypic resistance to erythromycin, clindamycin, and tetracycline was observed in 16.1%, 3.8%, and 91.5% of isolates, respectively. ermTR (34.9%) and mefA/E (30.1%) genes were most common among erythromycin-resistant isolates, while ermB predominated in clindamycin-resistant isolates (32.0%). tetM accounted for 95.8% of tetracycline resistance. All isolates carried at least 1 of the 3 pilus gene clusters, 1 of the 4 homologous alpha/Rib family determinants, and 98% harbored 1 of the serine-rich repeat protein genes. hvgA was found exclusively in CC17 isolates.
conclusionsIn our setting, β-lactam antibiotics remain appropriate for GBS treatment and polysaccharide and protein-based vaccines under development are expected to provide good coverage.
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