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Journal of Clinical Microbiology, September 2003, p. 4049-4053, Vol. 41, No. 9
0095-1137/03/$08.00+0     DOI: 10.1128/JCM.41.9.4049-4053.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Importance of Methodology in Determination of Chlamydia pneumoniae Seropositivity in Healthy Subjects and in Patients with Coronary Atherosclerosis

V. Y. Hoymans,1* J. M. Bosmans,1 L. Van Renterghem,2 R. Mak,3 D. Ursi,4 F. Wuyts,5 C. J. Vrints,1 and M. Ieven4

Departments of Cardiology,1 Microbiology,4 Medical Statistics, University of Antwerp, Edegem,5 Departments of Bacteriology and Virology,2 Public Health, Ghent University Hospital, Ghent, Belgium3

Received 25 November 2002/ Returned for modification 18 January 2003/ Accepted 4 April 2003

Enzyme immunoassays (EIAs) for the detection of Chlamydia pneumoniae antibodies were compared to the microimmunofluorescence (MIF) test, the reference method. Furthermore, we assessed the hypothesis that a possible relationship between Chlamydia pneumoniae immunoglobulin G (IgG) antibodies and coronary artery disease is dependent on the type of EIA. Sera from 112 healthy men (mean age, 50.1 years) were tested for antibodies against Chlamydia pneumoniae by five commercial test kits: Focus Chlamydia MIF IgG test, Labsystems Chlamydia pneumoniae IgG EIA (LS EIA), R-Biopharm Elegance Chlamydia pneumoniae IgG EIA (RB EIA), Medac Chlamydia pneumoniae IgG sandwich enzyme-linked immunosorbent assay ELISA (MCp sELISA) and Medac Chlamydia IgG recombinant enzyme-linked immunosorbent assay ELISA (MC rELISA). Sera from 106 consecutive male patients (mean age, 63.6 years) undergoing diagnostic coronary angiography were also examined using the Focus MIF, LS EIA, MCp sELISA, and MC rELISA techniques. The agreement between LS EIA (65 to 83% [controls-patients]) or MC rELISA (49 to 61%) and Focus MIF (78 to 83%) was average to fair ({kappa} = 0.597 and 0.234, respectively). MCp sELISA and RB EIA showed good agreement with MIF ({kappa} = 0.686 and 0.665, respectively), with 80 to 89 and 79% of individuals reacting positively. A significant difference in seroprevalence between patients and healthy subjects was observed with the LS EIA, while seropositivities in the two study groups appeared equal when the Focus MIF assay was applied. The MC rELISA and MCp sELISA gave statistically significant differences in antibody seroprevalence in patients with two-vessel disease or when the patient group combined individuals with a two- or a three-vessel disease, respectively. The concordance between MIF and other commonly used serological assays for C. pneumoniae IgG antibody detection is good to fair. The choice of serological assay has important implications for C. pneumoniae antibody seroprevalence, as well as for the relationship between C. pneumoniae seropositivity and coronary artery disease.


* Corresponding author. Mailing address: Department of Cardiology, University Hospital Antwerp/University of Antwerp, Wilrijkstraat 10, 2650 Edegem, Belgium. Phone: 32 38214946. Fax: 32 38302305. E-mail: vicky.hoymans{at}uza.be.


Journal of Clinical Microbiology, September 2003, p. 4049-4053, Vol. 41, No. 9
0095-1137/03/$08.00+0     DOI: 10.1128/JCM.41.9.4049-4053.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.




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