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Evaluation of antigen-specific immunoglobulin g responses in pulmonary tuberculosis patients and contacts

 Yun-Gyoung Hur  ;  Ahreum Kim  ;  Young Ae Kang  ;  An Sik Kim  ;  Dae Yeon Kim  ;  Yeun Kim  ;  Youngmi Kim  ;  Hyeyoung Lee  ;  Sang-Nae Cho 
 JOURNAL OF CLINICAL MICROBIOLOGY, Vol.53(3) : 904-909, 2015 
Journal Title
Issue Date
Adult ; Antibodies, Bacterial/blood* ; Antigens, Bacterial/immunology* ; Female ; Humans ; Immunoglobulin G/blood* ; Male ; Mycobacterium tuberculosis/immunology* ; Serologic Tests/methods ; Tuberculosis, Pulmonary/diagnosis ; Tuberculosis, Pulmonary/immunology*
This study aimed to evaluate the serodiagnostic potential of immunoglobulin G (IgG) responses to Mycobacterium tuberculosis antigens in pulmonary tuberculosis (TB) patients, recent TB contacts with latent TB infection (LTBI), and healthy subjects. Infections were assessed using tuberculin skin tests, QuantiFERON-TB Gold In-Tube tests, drug susceptibility testing, and molecular genotyping of clinical isolates. Serum IgG responses to selective M. tuberculosis antigens, including the 38-kDa and 16-kDa antigens, lipoarabinomannan (LAM), and recombinant early secreted antigen target 6 kDa (ESAT-6) and culture filtrate protein 10 kDa (CFP-10), were determined. We found that the serum IgG responses to all antigens might differentiate between active TB and LTBI, with LAM having the highest diagnostic value (area under the curve [AUC] of 0.7756, P < 0.001). Recurrent TB cases showed significantly higher IgG responses to 38 kDa, CFP-10 (P < 0.01), and LAM (P < 0.05) than new cases, and male patients had higher levels of antigen-specific IgG than females (P < 0.05). Conversely, drug resistance and patient body mass index did not affect IgG responses (P > 0.05). LAM-specific IgG responses differentiated between acid-fast bacillus (AFB) smear-positive and -negative patients (P < 0.01), whereas antigen-specific IgG responses did not vary with the M. tuberculosis genotype (P > 0.05). Significantly higher IgG responses to 38 kDa and 16 kDa were observed in AFB smear-negative patients than in controls. These results suggest that assessment of serum IgG responses to selective purified M. tuberculosis antigens may help improve the diagnosis of active TB, particularly for sputum smear-negative patients or recurrent cases, and these may also help to differentiate between active TB and LTBI.
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1. College of Medicine (의과대학) > Dept. of Microbiology (미생물학교실) > 1. Journal Papers
1. College of Medicine (의과대학) > Yonsei Biomedical Research Center (연세의생명연구원) > 1. Journal Papers
1. College of Medicine (의과대학) > Dept. of Internal Medicine (내과학교실) > 1. Journal Papers
Yonsei Authors
Kang, Young Ae(강영애) ORCID logo https://orcid.org/0000-0002-7783-5271
Kim, Ah Reum(김아름) ORCID logo https://orcid.org/0000-0001-5938-4270
Kim, Young Mi(김영미)
Cho, Sang Nae(조상래)
Hur, Yun-Gyoung(허윤경) ORCID logo https://orcid.org/0000-0003-3986-4394
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