1. Biofilm formation of beta-hemolytic group G Streptococcus dysgalactiae subspecies equisimilis isolates and its association with emm polymorphism.
- Author
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Ma JS, Chen SY, and Lo HH
- Subjects
- Bacterial Typing Techniques, Biofilms growth & development, Culture Media chemistry, Culture Media pharmacology, Gene Expression, Glucose metabolism, Humans, Polymorphism, Genetic, Streptococcal Infections epidemiology, Streptococcal Infections microbiology, Streptococcus classification, Streptococcus isolation & purification, Taiwan epidemiology, Antigens, Bacterial genetics, Bacterial Outer Membrane Proteins genetics, Biofilms drug effects, Carrier Proteins genetics, Glucose pharmacology, Streptococcus drug effects, Streptococcus genetics
- Abstract
Biofilm formation has been well known as a determinant of bacterial virulence. Group G Streptococcus dysgalactiae subspecies equisimilis (SDSE), a relevant pathogen with increasing medical importance, was evaluated for the biofilm-forming potential. Microtiter plate assay was used to assess the most feasible medium for group G SDSE to form a biofilm. Among 246 SDSE isolates examined, 46.7%, 43.5%, 33.3%, and 26.4% of isolates showed moderate or strong biofilm-forming abilities using tryptic soy broth (TSB), brain heart infusion broth (BHI), Todd-Hewitt broth (THB), and C medium with 30 mM glucose (CMG), respectively. The addition of glucose significantly increased the biofilm-forming ability of group G SDSE. FCT (fibronectin-collagen-T-antigen) typing of SDSE was first undertaken and 11 FCT types were found. Positive associations of stG10.0 or negative associations of stG245.0, stG840.0, and stG6.1 with biofilm-forming ability of SDSE were, respectively, found. This was the first investigation demonstrating biofilm-forming potential in clinical group G SDSE isolates; also, some significant associations of biofilm-forming ability with certain emm types were presented., (© 2017 APMIS. Published by John Wiley & Sons Ltd.)
- Published
- 2017
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