Evaluation of IgG ELISA using N-lauroyl-sarcosine-soluble proteins of Bartonella henselae for highly specific serodiagnosis of cat scratch disease.
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.
Department of Clinical Laboratory Science, Division of Health Science, Yamaguchi University Graduate School of Medicine, Ube, Yamaguchi 755-8505, Japan. htsune@yamaguchi-u.ac.jp
Keiko
K
Tsuruoka
Hidehiro
H
Tsuneoka
Mitsunobu
M
Kawano
Masashi
M
Yanagihara
Junzo
J
Nojima
Tatehiko
T
Tanaka
Misa
M
Yamamoto
Kiyoshi
K
Ichihara
D000328:Adult; D000907:Antibodies, Bacterial / Q000097:blood*; D000942:Antigens, Bacterial / Q000302:isolation & purification; D001426:Bacterial Proteins / Q000302:isolation & purification; D018416:Bartonella henselae / Q000276:immunology*; D002372:Cat-Scratch Disease / Q000175:diagnosis*; D002648:Child; D002675:Child, Preschool; D003902:Detergents / Q000378:metabolism; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods; D006801:Humans; D007074:Immunoglobulin G / Q000097:blood*; D012521:Sarcosine / Q000031:analogs & derivatives / Q000378:metabolism; D012680:Sensitivity and Specificity; D012698:Serologic Tests / Q000379:methods
D000907:Antibodies, Bacterial; D000942:Antigens, Bacterial; D001426:Bacterial Proteins; D003902:Detergents; D007074:Immunoglobulin G; C025231:sarkosyl; D012521:Sarcosine