Evaluation of a rapid latex agglutination test for identification of group D streptococci

Vanzo, S J; Washington, John A.

doi:10.1128/jcm.20.3.575-576.1984

Cited by 4 publications

(1 citation statement)

References 5 publications

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“…Although all the Lancefield reagents have been used on nonbeta-hemolytic streptococci, only group B and D reagents are recommended for this purpose (5). 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.…”

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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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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: 99%