Streptococcus Faecalis: Group D or Group G?

Birch, B.R.; Keaney, M.G.L.; Ganguli, L. A.

doi:10.1016/s0140-6736(84)92306-7

Cited by 7 publications

(7 citation statements)

References 2 publications

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“…We have shown that over 20% of our isolates of enterococci possess enzyme-extractable antigen that reacts with both the group D and the group G Lancefield reagents. This is lower than the 47% reported in England (2). In addition, only one of our strains caused beta-hemolysis, whereas most of the isolates in the English study were strongly beta-hemolytic.…”

contrasting

confidence: 82%

“…Major problems, such as false-negative results with group D reagents (3,6,18,21) and cross-reactions between Streptococcus pneumoniae (23) and Klebsiella pneumoniae with the group C reagent, have still been encountered in these evaluations (16). Recently, Birch et al (2) reported that 17 of 36 strains of S. faecalis isolated from patients in four hospitals in England possessed Lancefield antigen reactive with both group D and group G reagents. Most of the isolates in their report were betahemolytic.…”

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confidence: 99%

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Enzyme release of antigen from Streptococcus faecalis and Listeria monocytogenes cross-reactive with Lancefield group G typing reagents

et al. 1985

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Enzyme extraction methods are commonly used to release antigen for Lancefield serogrouping of streptococci. Recently, up to 47% of enterococci have been found to possess antigens cross-reactive with both the group D and the group G grouping reagents. We investigated whether the organisms had recently emerged or whether changes in extraction methods (enzyme extraction) have resulted in our awareness of their existence. We found that approxiimately 20% of our enterococcal isolates released material cross-reactive with the group G reagents. These organisms have been present for at least 6 years, and probably for many more. In addition, we found that most strains of Listeria monocytogenes also released antigen cross-reactive with the group G reagent. The clinical significance of these findings is also discussed.

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confidence: 82%

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confidence: 99%

Enzyme release of antigen from Streptococcus faecalis and Listeria monocytogenes cross-reactive with Lancefield group G typing reagents

et al. 1985

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“…Gross et al (1975) also described this biochemical phenotype in an unknown proportion of the 546 clinical isolates of S. faecalis. Recently, delayed sorbitol fermentation has been reported as a characteristic of S. faecalis strains that possessed the Lancefield group-G antigen as well as the group-D antigen (Birch et al, 1984(Birch et al, , 1985. Indeed, according to Birch et al (1985), "delayed sorbitol fermentation occurs only amongst strains from certain geographical areas and has not been encountered in any conventional group D strains".…”

Section: Discussionmentioning

confidence: 99%

“…Recently, delayed sorbitol fermentation has been reported as a characteristic of S. faecalis strains that possessed the Lancefield group-G antigen as well as the group-D antigen (Birch et al, 1984(Birch et al, , 1985. Indeed, according to Birch et al (1985), "delayed sorbitol fermentation occurs only amongst strains from certain geographical areas and has not been encountered in any conventional group D strains". Herein the slow sorbitol-fermenting oral isolates lacked group-G antigen and seemed as conventional in other respects as isolates examined by others (Facklam, 1972;Gross et al, 1975;Colman and Ball, 1984;Facklam and Carey, 1985).…”

Section: Discussionmentioning

confidence: 99%

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Biotyping, serotyping and phage typing of Streptococcus faecalis isolated from dental plaque in the human mouth

Smyth

Matthews

Halpenny

et al. 1987

Journal of Medical Microbiology

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Summary. Thirty Streptococcus faecalis isolates from mixed dental plaque samples were classified into four groups on the basis of biotype, tetracycline susceptibility, phage type and serotype combinations. The organisms were from patients on haemodialysis, from staff of the dialysis unit, and from controls. Three biotypes were distinguished by seven biochemical tests: production of acid from inositol, sucrose and xylose; rapid or delayed production of acid from sorbitol; gelatin liquefaction; and production of alkaline phosphatase and P-galactosidase. With a set of eight typing antisera for S. faecalis, 15 strains were non-typable, 12 were serotype 1 and three were serotype 19. With a set of 17 bacteriophages specific for S. faecalis, all of the oral isolates were typable; 40% were lysotype 1, and the remainder lysotype V6b. On the basis of biotype-serotype-phage-type combinations, indications of possible spread of strains between haemodialysis patients and dialysis unit staff were obtained. Biotyping and serotyping of 13 German isolates of S . faecalis of phage type 1 1 from four clinical sources and tripartite typing of three control strains provided additional evidence for the potential of biotyping in distinguishing between strains of identical serotype and phage type. One oral isolate of S. faeciurn was of phage type XX. None of the oral isolates of S. faecalis, of which 14 exhibited delayed sorbitol fermentation, reacted with group-G streptococcal grouping reagents or antiserum. Slow sorbitol fermentation does not appear to be a definitive phenotypic marker for S. faecalis strains possessing antigens that react with both group-D and group-G grouping reagents.

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Streptococci with dual antigen specificity for Lancefield groups D and G

Harvey

McIllmurray

1984

Eur. J, Clin. Microbiol.

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Streptococci have been isolated which may be identified in serological tests as belonging to Lancefield group G, but in fact belong to group D. Twenty-two cultures with this property were obtained from four countries; they included Streptococcus bovis and Streptococcus durans as well as Streptococcus faecalis. Selected strains were studied in serological tests and cross-absorption procedures, in which it was found that the group G reaction given by these isolates is due to an epitope with at least partial identity with reference group G antigen. Identification of an enterococcus as a group G streptococcus could lead to erroneous and ineffective chemotherapy. Antibiotic sensitivity testing of streptococcus group G isolates should be a routine procedure, and bile-aesculin and salt-tolerance testing of these isolates would be a wise precaution.

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Streptococcus Faecalis: Group D or Group G?

Cited by 7 publications

References 2 publications

Enzyme release of antigen from Streptococcus faecalis and Listeria monocytogenes cross-reactive with Lancefield group G typing reagents

Enzyme release of antigen from Streptococcus faecalis and Listeria monocytogenes cross-reactive with Lancefield group G typing reagents

Biotyping, serotyping and phage typing of Streptococcus faecalis isolated from dental plaque in the human mouth

Streptococci with dual antigen specificity for Lancefield groups D and G

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