Discrepant Satellitism for Identification of<i>Granulicatella</i>adiacens Isolates

Koh, Young Rae; Yi, Jongyoun; Kim, Hyung Hoi; Chang, Chulhun L.; Kim, Shine Young

doi:10.3343/alm.2014.34.2.174

Cited by 9 publications

(20 citation statements)

References 6 publications

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“…The NVS have also been associated with other invasive infections, including abscess, wound infections, and meningitis (1,12). The incidence of IE caused by NVS may be underreported due to the fastidious nature of these organisms and the challenge of recovering isolates from clinical specimens (i.e., "culture-negative IE") (11,(13)(14)(15)(16). Nevertheless, retrospective case review has demonstrated that cases of NVS IE are associated with higher rates of complications, including relapse, bacteriologic failure, embolization, and death, than IE caused by other streptococci (17).…”

Section: T He Nutritionally Variant Streptococci (Nvs) Are Fastidiousmentioning

confidence: 99%

Antimicrobial Susceptibilities of Abiotrophia defectiva, Granulicatella adiacens, and Granulicatella elegans

Alberti

Hindler

Humphries

2016

Antimicrob Agents Chemother

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Nutritionally variant streptococci (NVS) are fastidious Gram-positive cocci comprised of the species Abiotrophia defectiva, Granulicatella adiacens, and Granulicatella elegans. NVS are an important cause of bacteremia and infective endocarditis (IE) associated with significant morbidity and mortality. Antimicrobial susceptibility testing (AST) was performed for 14 antimicrobials using the broth microdilution MIC method described in the Clinical and Laboratory Standards Institute (CLSI) M45 guideline. A total of 132 clinical NVS blood isolates collected from 2008 to 2014 were tested. Species level identification of NVS isolates was achieved by 16S rRNA gene sequencing and/or matrix-assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF MS). Ninety isolates were identified as G. adiacens, 37 as A. defectiva, and 5 as G. elegans. All isolates were susceptible to vancomycin (MIC 90 ‫؍‬ 1 g/ml), and none displayed high-level resistance to aminoglycosides. G. adiacens was considerably more susceptible to penicillin than A. defectiva (38.9% versus 10.8% of isolates susceptible) but was less susceptible to cephalosporins than was A. defectiva (43.3% versus 100% of isolates susceptible to ceftriaxone). Several isolates were resistant to levofloxacin (6%), erythromycin (51%), and clindamycin (10%). The MIC 90 for daptomycin was >4 g/ml for G. adiacens and A. defectiva. G. elegans isolates were 100% susceptible to all antimicrobials tested, with the exception of erythromycin, to which only 20% were susceptible. This study provides antimicrobial susceptibility data for a recent collection of NVS and demonstrates important NVS species-related differences with respect to susceptibility to penicillin, cephalosporins, carbapenems, and daptomycin. Species-level identification of NVS organisms when susceptibility testing is not readily available may aid in treatment decisions.

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Section: T He Nutritionally Variant Streptococci (Nvs) Are Fastidiousmentioning

confidence: 99%

Antimicrobial Susceptibilities of Abiotrophia defectiva, Granulicatella adiacens, and Granulicatella elegans

Alberti

Hindler

Humphries

2016

Antimicrob Agents Chemother

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“…Their co-occurrence may be important to their neoplasia-promoting effect and subsequent development of gastric cancer as we previously reported. 26 Granulicatella is gram-positive facultative anaerobe linked to root canal infection and was isolated from the peritoneal fluid of a patient with gastric cancer, 40 41 while Abiotrophia was highlighted as a potential risk element for gastric cancer, 25 further supporting their potential involvement in development of gastric atrophy. Mesorhizobium , a nitrogen-fixing bacterium, which was characterised as being able to invade human cells, 42 was enriched in patients whose IM progressed within 1 year following H. pylori eradication.…”

Section: Discussionmentioning

confidence: 99%

Gastric microbes associated with gastric inflammation, atrophy and intestinal metaplasia 1 year afterHelicobacter pylorieradication

Sung

Coker

Chu

et al. 2020

Gut

185

166

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ObjectiveHelicobacter pylori is associated with gastric inflammation, precancerous gastric atrophy (GA) and intestinal metaplasia (IM). We aimed to identify microbes that are associated with progressive inflammation, GA and IM 1 year after H. pylori eradication.DesignA total of 587 H.pylori–positive patients were randomised to receive H. pylori eradication therapy (295 patients) or placebo (292 patients). Bacterial taxonomy was analysed on 404 gastric biopsy samples comprising 102 pairs before and after 1 year H. pylori eradication and 100 pairs before and after 1 year placebo by 16S rRNA sequencing.ResultsAnalysis of microbial sequences confirmed the eradication of H. pylori in treated group after 1 year. Principal component analysis revealed distinct microbial clusters reflected by increase in bacterial diversity (p<0.00001) after H. pylori eradication. While microbial interactions remained largely unchanged after placebo treatment, microbial co-occurrence was less in treated group. Acinetobacter lwoffii, Streptococcus anginosus and Ralstonia were enriched while Roseburia and Sphingomonas were depleted in patients with persistent inflammation 1 year after H. pylori eradication. A distinct cluster of oral bacteria comprising Peptostreptococcus, Streptococcus, Parvimonas, Prevotella, Rothia and Granulicatella were associated with emergence and persistence of GA and IM. Probiotic Faecalibacterium praustznii was depleted in subjects who developed GA following H. pylori eradication. Functional pathways including amino acid metabolism and inositol phosphate metabolism were enriched while folate biosynthesis and NOD-like receptor signalling decreased in atrophy/IM-associated gastric microbiota.ConclusionThis study identified that gastric microbes contribute to the progression of gastric carcinogenesis after H. pylori eradication.

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“…Granulicatella adiacens requires key nutrients from other bacterial organisms and grows well as satellite colonies (Koh et al . ). Granulicatella adiacens was first characterized as a nutritional variant streptococci (Bouvet et al .…”

Section: Resultsmentioning

confidence: 97%

“…It was detected in biofilm samples as one of the main taxa that grew within the biofilm system with Streptococcus spp. Granulicatella adiacens requires key nutrients from other bacterial organisms and grows well as satellite colonies (Koh et al 2014). Granulicatella adiacens was first characterized as a nutritional variant streptococci (Bouvet et al 1989) with its pleomorphic gram-positive cocci forming chains but recently recategorized through 16S rRNA gene sequencing (Collins and Lawson 2000).…”

Section: Resultsmentioning

confidence: 99%

Biofilm community diversity after exposure to 0·4% stannous fluoride gels

et al. 2014

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Aims To test the effect of %0.4 stannous fluoride (SnF2) glycerin based gels on the bacterial ecology in both a clinical observational study and in vitro polymicobial biofilm model. Methods and Results The influence of stannous fluoride (0.4% SnF2) gels on bacteria was tested in both an observational study in children 6-12 years of age (n=20) and an in vitro biofilm model system. The plaque derived multi-species bacterial biofilm model was based on clinical bacterial strains derived directly from the clinical study. Potential changes in the plaque ecology were determined through the Human Oral Microbial Identification Microarray-HOMIM (n=10). The semiquantitative data resulting from this system were analyzed with cumulative logit models for each bacterial strain and Bonferroni adjustments were employed to correct for multiple hypothesis testing. Both hierarchical biclustering and principal components analysis were used to graphically assess reproducibility within subjects over time. Mixed effects models were used to examine changes in plaque scores and numbers of bacterial strains found in the various conditions. Conclusions Both the observational clinical study and the biofilm model showed that short-term use of 0.4% SnF2 gel has little effect on the bacterial plaque ecology. The amount of plaque accumulation on a subject's teeth, which was measured by plaque index scores failed to show statistical significant changes over the two baselines or after treatment (p=0.9928). The in vitro results were similar when examining the effect of 0.4% SnF2 gels on biofilm adherence through a crystal violet assay (p= 0.1157). Significance and Impact of the Study The bacteria within the dental biofilms showed resilience in maintaining the overall community diversity after exposure to 0.4% Stannous Fluoride Gels. The study supports that the immediate benefits of using these gels each night to manage caries in children may be strictly from fluoride ions inhibiting tooth demineralization.

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Discrepant Satellitism for Identification ofGranulicatellaadiacens Isolates

Cited by 9 publications

References 6 publications

Antimicrobial Susceptibilities of Abiotrophia defectiva, Granulicatella adiacens, and Granulicatella elegans

Antimicrobial Susceptibilities of Abiotrophia defectiva, Granulicatella adiacens, and Granulicatella elegans

Gastric microbes associated with gastric inflammation, atrophy and intestinal metaplasia 1 year afterHelicobacter pylorieradication

Biofilm community diversity after exposure to 0·4% stannous fluoride gels

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