Journal
DIAGNOSTIC MICROBIOLOGY AND INFECTIOUS DISEASE
Volume 74, Issue 3, Pages 230-235Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.diagmicrobio.2012.06.028
Keywords
Cat scratch disease; Bartonella henselae; ELISA; IgG; N-Lauroyl sarcosine
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Funding
- Ministry of Education, Science, Sports, and Culture of Japan [23590673]
- Grants-in-Aid for Scientific Research [24790554, 23590673] Funding Source: KAKEN
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Conventional IgG-ELISA methods for diagnosing cat scratch disease (CSD) caused by Bartonella hensela are still poor in sensitivity and specificity, which generally employ bacterial whole-cell proteins or N-lauroyl-sarcosine-insoluble proteins as the antigen. By Western blot analysis, we found that sarcosine-soluble fraction of proteins (SSP) showed highly specific reaction to immunofluorescence assay (IFA)-positive sera obtained from CSD patients compared with the above antigens. Clinical utility of the new ELISA employing SSP was evaluated using sera from 118 patients with clinically suspected CSD (sera positive by IFA: titers >= 1:256, n = 46; negative: titers <128, n = 72) and 88 sera from healthy individuals. Sensitivity and specificity of distinguishing IFA-positive patients from healthy individuals were 95.7% and 97.7%, respectively. Fifteen discordant results were observed (13 ELISA(+)/IFA(-); 2 ELISA(-)/IFA(+)). However, all 15 sera reacted with SSP by Western blot analysis, indicating superiority of the new ELISA over IFA. The ELISA employing SSP greatly improved the accuracy of diagnoSing CSD. (C) 2012 Elsevier Inc. All rights reserved.
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