NDLI: Diagnosis of Invasive Pneumococcal Infection by Serotype-Specific Urinary Antigen Detection

Content Provider	PubMed Central
Author	Leeming, John P. Cartwright, Keith Morris, Rhonwen Martin, Siobhan A. Smith, Michael D.
Copyright Year	2005
Abstract	Widespread use of conjugate pneumococcal polysaccharide-protein vaccines may alter the spectrum of pneumococci producing invasive disease. Novel sensitive diagnostic methods would be valuable for monitoring the epidemiology of pneumococcal disease within populations and vaccine recipients. Ideally, these methods should allow determination of the serotype of the infecting clone. Serotype-specific enzyme-linked immunosorbent assays (ELISA) for 13 capsular polysaccharides (types 1, 3, 4, 5, 6A, 6B, 7A, 9V, 14, 18C, 19A, 19F, and 23F) were developed. Experiments with pure capsular polysaccharide demonstrated that the assays were sensitive (0.01 to 1.0 ng/ml) and specific. These assays were used to detect capsular polysaccharide in urine from 263 adult patients with proven (blood culture-positive) invasive pneumococcal disease and pneumonia of unknown etiology and from patients with positive blood cultures yielding bacteria other than pneumococci (control group). Among 76 patients with invasive pneumococcal disease from whom blood culture isolates had been serotyped, 62 (82%) had infections with pneumococci of serotypes represented in the ELISA panel. Capsular antigen matching the serotype of the blood culture isolate was detected in the urine of 52 of these patients, giving a sensitivity of 83.9% for the target serotypes. The tests were significantly more sensitive for urine from patients with pneumococcal pneumonia (89.8%) than for urine from patients with nonpneumonic invasive infection (61.5%; P < 0.05). Data from the control group indicated a specificity of 98.8%. These assays should prove valuable in epidemiological investigation of invasive pneumococcal infection in adults, particularly if combined with a sensitive C-polysaccharide detection assay to screen for positive samples.
Related Links	http://dx.doi.org/10.1128/JCM.43.10.4972-4976.2005
Starting Page	4972
File Format	PDF
ISSN	1098660X
e-ISSN	1098660X
Journal	Journal of Clinical Microbiology
Issue Number	10
Volume Number	43
Language	English
Publisher	American Society for Microbiology
Publisher Date	2005-10-01
Access Restriction	Open
Rights Holder	American Society for Microbiology
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Microbiology (medical)

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