Evaluation of five rapid systems for the identification of Neisseria gonorrhoeae
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Neisseria gonorrhoeae
Neisseriaceae
Neisseria
Identification
A DNA probe test for the culture confirmation of Neisseria gonorrhoeae in clinical isolates was evaluated with 156 isolates of N. gonorrhoeae and 120 isolates of nongonococcal Neisseria species, organisms representative of other genera within the family Neisseriaceae, and organisms isolated on media selective for N. gonorrhoeae. The 30-min test used a chemiluminescent DNA probe that was homologous to rRNA sequences of N. gonorrhoeae. We report here a specificity and a sensitivity of 100% with the 276 clinical isolates tested, including 43 gonococcal strains that had been misidentified by other methods.
Neisseria gonorrhoeae
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Gonococci were found by culture in 112 of 442 patients suspected of having gonorrhoea. Meningococci were cultured from the pharynx more than twice as often in patients harbouring gonococci (26%) than in patients from whom gonococci could not be cultured (11%). These results could indicate an individual susceptibility to Neisseria organisms or they could be caused by a difference in the behaviour of patients with and without gonorrhoea, the conduct of the former making them not only more likely to be infected with Neisseria gonorrhoeae but possibly more exposed to Neisseria meningitidis as well.
Neisseria gonorrhoeae
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The Phadebact Monoclonal GC OMNI Test (Pharmacia Diagnostics, Piscataway, N.J.) is used for the definitive identification of Neisseria gonorrhoeae. In this test, boiled organisms are examined by using a 1-min coagglutination technique. A total of 776 Neisseria strains, confirmed to the species level by patterns of acid production from carbohydrates incorporated in cysteine-tryptose agar or morphologically consistent with Neisseria meningitidis and fluorescent antibody negative, were tested by the coagglutination technique. Of the 516 isolates of N. gonorrhoeae, 8 (1.6%) were negative with the OMNI Test. Of the 260 isolates of Neisseria spp. other than N. gonorrhoeae, none showed a positive coagglutination reaction. The Phadebact Monoclonal GC OMNI Test provided rapid, accurate identification of N. gonorrhoeae (sensitivity, 98.4%; specificity, 100%).
Neisseria gonorrhoeae
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Neisseriaceae
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A group of five tests utilizing wheat germ and soybean lectins and chromogenic substrates (orthonitrophenyl-beta-D-galactopyranoside, gamma-glutamyl-beta-naphthylamide, and prolyl-beta-naphthylamide derivatives) was used as a rapid (30-min) method for the identification of Neisseria gonorrhoeae. The rapid method agreed with Minitek test results for all 126 N. gonorrhoeae isolates and all 39 nongonococcal isolates tested. Soybean lectin was useful for the identification of rare strains (4 of 126) of N. gonorrhoeae which are not agglutinated by wheat germ lectin. The chromogenic substrates differentiate N. gonorrhoeae from Neisseria meningitidis, Neisseria lactamica, and other Neisseria species which may grow on Thayer-Martin or other selective media.
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Wheat-germ agglutination (WGA) was used to identify 168 strains of Neisseria gonorrhoeae and 105 strains of other Neisseria species in a routine laboratory. About one-third of the meningococci reacted with the lectin and titres with some organisms varied on repeat testing. The technique is regarded as unreliable for the identification of Neisseria species.
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A problem isolate resembling Neisseria gonorrhoeae and Neisseria meningitidis is reported. Growth and biochemical characteristics indicated the organism to be N. meningitidis, whereas serological characteristics indicated it to be N. gonorrhoeae. This vaginal isolate may be a genetically transformed gonococcus with the ability to utilize maltose. Conversely, it may be a meningococcus which has acquired antigenic determinants of N. gonorrhoeae.
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The adhC gene from 11 strains of Neisseria gonorrhoeae was distinguished from its homologue in Neisseria meningitidis by the presence of a premature stop codon caused by a single base insertion. Mutational analysis showed that NADH S-nitrosoglutathione oxidoreductase activity was associated with adhC in Neisseria meningitidis but not in Neisseria gonorrhoeae.
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Journal Article An Indirect Fluorescent-Antibody Technique for Study of Uncomplicated Gonorrhea. n. Selection and Characterization of the Strain of Neisseria gonorrhoeae Used as Antigen Get access Richard J. O'Reilly, Richard J. O'Reilly Search for other works by this author on: Oxford Academic PubMed Google Scholar Bobby G. Welch, Bobby G. Welch Search for other works by this author on: Oxford Academic PubMed Google Scholar Douglas S. Kellogg, Jr. Douglas S. Kellogg, Jr. Search for other works by this author on: Oxford Academic PubMed Google Scholar The Journal of Infectious Diseases, Volume 127, Issue 1, January 1973, Pages 77–83, https://doi.org/10.1093/infdis/127.1.77 Published: 01 January 1973 Article history Received: 09 June 1972 Revision received: 01 September 1972 Published: 01 January 1973
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Neisseria gonorrhoeae
Neisseriaceae
Neisseria
Identification
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High-resolution two-dimensional polyacrylamide gel electrophoresis was used to analyse the soluble proteins from seven strains of Neisseria gonorrhoeae, six strains of Neisseria meningitidis and one or two strains of twelve other species. Approximately 200 individual polypeptides could be visualized as Coomassie Blue stained spots on an electrophoretogram of N. gonorrhoeae and similar numbers were found for the other bacteria. Each species of bacterium had a distinctly different pattern of spots which could be recognized. Quantitative comparisons of 48 selected spots derived from one strain of N. gonorrhoeae with those of five other strains of gonococcus, three strains of N. meningitidis and one of Branhamella catarrhalis, showed relationships in agreement with their current taxonomic classification but with a higher level of discrimination than that of previously used methods. It was also possible to distinguish the individual gonococcal strains. It is suggested that the method could be useful for bacterial classification and identification.
Neisseria gonorrhoeae
Neisseriaceae
Neisseria
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