가존재하는것으로판단하는것이다 [6]. 입자응집법을이용해급성감염을진단하는경우는항체희석역가가 5일이상후추적검사시 4배이상증가한경우이거나첫검사시항체희석역가가 1:32 이상일때감염으로판정한다 [8]. 그러나입자응집법은급성기에나타나는위음성결과의문제점, IgG와 IgM을구별할수없

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Download "가존재하는것으로판단하는것이다 [6]. 입자응집법을이용해급성감염을진단하는경우는항체희석역가가 5일이상후추적검사시 4배이상증가한경우이거나첫검사시항체희석역가가 1:32 이상일때감염으로판정한다 [8]. 그러나입자응집법은급성기에나타나는위음성결과의문제점, IgG와 IgM을구별할수없"

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1 원저 Lab Med Online Vol. 2, No. 1: 41-46, January 진단면역학 Mycoplasma pneumoniae 특이항체검사에서입자응집법과효소면역측정법의비교 The Comparison between Particle Agglutination Assay and Enzyme Immunoassay in the Detection of Mycoplasma pneumoniae-specific Antibody 정혜원 전래희 김신규 Hae Won Jung, M.D., La-He Jearn, M.D., Think-You Kim, M.D. 한양대학병원진단검사의학과 Department of Laboratory Medicine, Hanyang University Medical Center, Seoul, Korea Background: The two common serological test methods used for initial diagnosis of acute Mycoplasma pneumoniae (MP) pneumonia are particle agglutination assay (PA) and enzyme immunoassay (EIA). We compared the differences between the two methods and suggest a test method more suitable for clinical laboratories. Methods: A total of 35 patients (18 adult and 17 pediatric) performed MP specific antibody test using PA (Serodia-Myco II, Fujirebio, Japan) and EIA (Ani Labsystems, Finland) methods. IgM and IgG antibodies were measured separately by EIA method. PA and both IgM and IgG EIA were tested in 26 patients and PA and IgG-EIA were tested in 9 patients. Results: The concordance rates between PA and EIA were 57.7% for IgM and 65.7% for IgG antibodies. Positive PA results showed better agreement with IgG (77.8%) than IgM (38.9%), while negative PA results showed better agreement with IgM (1%) than IgG EIA results (25%). In adult patients, the correlation between PA titers and IgM (r=.852, P <.1) and IgG values (r=.517, P <.5) were statistically significant. In pediatric patients, the correlation between PA titers and IgG values (r=.842, P <.1) was statistically significant. Conclusions: In this study, we observed that PA and EIA may not be used alternatively. Therefore, we suggest that use of both PA and IgM-EIA will be the optimal choice for laboratories. However, when laboratories are required to select one from PA or EIA, PA may be more useful to diagnose MP infection. Key Words: Mycoplasma pneumoniae, Particle agglutination, Enzyme immunoassay 서론 폐렴미코플라스마는주로학령기아동또는젊은성인에서폐렴 을일으키는원인균으로알려져있다 [1]. 폐렴미코플라스마는호흡 기이외에도신경계 [1, 2], 심혈관계 [3-5] 등에서다양한합병증을 Corresponding author: La-He Jearn, M.D. Department of Laboratory Medicine, Hanyang University Hospital, 17 Haengdang-dong, Seongdong-gu, Seoul , Korea Tel: , Fax: , lhchun@hanyang.ac.kr Received: August 22, 211 Revision received: September 3, 211 Accepted: September 3, 211 This article is available from 212, Laboratory Medicine Online This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. 일으키는비정형폐렴의가장흔한원인이다 [1]. 폐렴미코플라스마에의한폐렴은 beta-lactam 계열의경험적항생제치료에반응하지않고 macrolide 나 tetracycline 등의항균제에반응하므로조기의정확한감별진단이필요하다 [2]. 폐렴미코플라스마를위한검사에는배양법, 혈청학적검사법, 중합효소연쇄반응법이있으나 [6] 조기진단에유용한빠르고정확한기준검사방법은아직없어 [3] 현재많은검사실에서는쉽고간편한혈청학적검사에주로의존하고있다 [4]. 혈청학적검사로국내에서주로사용되는방법은입자응집법 (Particle agglutination assay, PA) 과효소면역측정법 (Enzyme immunoassay, EIA) 을이용한 IgM 또는 IgG 측정검사법이다 [6]. 입자응집법은방법이쉽고간편하면서도정량적검사가가능하다는장점이있어국내에서많이사용되는검사법이다 [7]. 입자응집법의원리는폐렴미코플라스마세포막으로감작된젤라틴입자가환자혈청과반응하여응집되면환자의혈청에폐렴미코플라스마항체 eissn

2 가존재하는것으로판단하는것이다 [6]. 입자응집법을이용해급성감염을진단하는경우는항체희석역가가 5일이상후추적검사시 4배이상증가한경우이거나첫검사시항체희석역가가 1:32 이상일때감염으로판정한다 [8]. 그러나입자응집법은급성기에나타나는위음성결과의문제점, IgG와 IgM을구별할수없다는점, 확진을위해항체역가상승을확인하는추적검사가필요하다는점 [9] 그리고불현성감염상태에서항체반응이낮은점등의단점이알려져있다 [6]. 한편효소면역측정법은효소를표지자로이용하여항원과항체간의반응유무와정도를측정하는방법으로효소가기질과반응하여발색한후측정된발색량이항원이나항체의양과비례또는반비례하는점을이용한검사법이다. 현재효소면역측정법은빠르고간편하며 IgM과 IgG가구별되는장점이있어널리보급되고있는추세이다 [5]. 그러나효소면역측정법역시급성감염기에나타나는 IgM 위음성결과와 [1] 저역가의 IgG를해석하는기준이모호하다는 [7] 점등의단점이있어결과해석시주의를요한다. 이에저자는본기관에서의입자응집법과효소면역측정법간일치율과상관관계를조사하여두검사법의유용성을알아보고자하였다. 대상및방법 1. 대상 총 35명의환자를대상으로폐렴미코플라스마특이항체검사를입자응집법과효소면역측정법을이용해시행하였다. 효소면역측정법은 IgM과 IgG를구분하여검사하였다. 대상환자중 34명은폐렴미코플라스마감염이의심되는환자였고 1명은과거폐렴미코플라스마감염으로진단된후추적관찰을위해내원한환자였다. 대상환자중성인은 18명, 소아는 17명이었다. 35명의환자중 26명은입자응집법과 IgM 및 IgG 효소면역측정법을모두시행하였고 9명의환자는 IgG 검사만을시행하였다. 대상환자들의나이분포는 3세부터 8세까지였고평균연령은 3.7세였으며여자가 19명, 남자가 16명이었고 세이상부터 18세미만의환자를소아환자군으로분류하였다. 2. 방법입자응집법을이용한폐렴미코플라스마특이항체측정을위해 Serodia-Myco II (Fujirebio, Tokyo, Japan) 를이용하였고입자응집법의결과는역가 1:4 이상일때양성으로판정하였다. 효소면역측정법을이용한 IgM과 IgG 측정을위해 Mycoplasma pneumoniae IgM과 IgG EIA (Ani Labsystems, Vantaa, Finland) 를이용하였다. IgM과 IgG의측정값은각각제조사가제시한 Enzyme immunounits (EIU) 으로표시하였고각각 1.1 EIU/mL 과 45 EIU/mL 이상의결과를보이는검체를양성으로해석하였다. 입자응집법 과효소면역측정법의검사간비교를위해두검사간양성및음 성결과의전체일치율을비교하였고입자응집법역가에따른검 사간전체결과및일치율을조사하였다. 전체, 성인및소아환자 군에서입자응집법항체역가와효소면역측정법측정값간의상 관관계를분석하였다. 3. 통계 입자응집법희석역가와효소면역측정법측정값간의상관관계 분석을위해 SPSS (version 12., SPSS Inc., Chicago, IL, USA) 를이 용하였고 MS Excel (Microsoft Corp., Redmond, WA, USA) 를이용 하여입자응집법역가에따른효소면역측정법측정값을도식화하 고상관계수를산출하였다. 전체환자에서입자응집법과 IgM 및 IgG 효소면역측정법의결과일치율을비교분석하기위해카이제 곱검정과 t 검정을시행하였다. 결과 1. 입자응집법과 IgM 및 IgG 효소면역측정법간일치율의비교 1) 양성및음성판정에대한입자응집법과 IgM 및 IgG 효소면역 측정법간의일치율 IgM 효소면역측정법을시행한 26 명중 15 명이입자응집법과일 치하는결과를보여결과일치율은 57.7% 였다. 양성및음성판정 에대한비교에서입자응집법음성환자 8 명중 8 명 (1%) 모두 IgM-EIA 음성으로일치하였고입자응집법양성환자 18 명중 7 명 (38.9%) 이 IgM-EIA 양성으로일치하였다. 입자응집법과 IgM-EIA 간판정의일치정도를측정하는일치측도 k 는.281 이었다 (P =.39)(Table 1). IgG 효소면역측정법을시행한 35 명중 23 명이입자응집법과일 치하는양성및음성결과를보여일치율은 65.7% 였다. 양성및음 성판정에대한비교에서입자응집법음성을보인환자 8 명중 2 명 Table 1. Comparison between PA and EIA methods in the detection of MP specific antibodies PA IgM-EIA* (N=26) Agreement IgG-EIA (N=35) Agreement *Measurement of agreement (k) between PA and IgM was.281 (P =.39). Measurement of agreement (k) between PA and IgG was.28 (P =.869). Agreement of positive and negative PA results with EIA results. Abbreviations: PA, particle agglutination assay; EIA, enzyme immunoassay; MP, Mycoplasma pneumoniae

3 (25%) 만이 IgG-EIA 음성으로결과가일치하였고입자응집법양성 환자 27 명중 21 명 (77.8%) 이 IgG-EIA 양성으로일치하였다. 입자 응집법과 IgG-EIA 간판정일치측도 k 는.28 이었다 (P =.869) (Table 1). 그밖에전체환자에서 IgM-EIA 양성환자 7 명모두입자응집법 및 IgG-EIA 양성이었고이들의입자응집법항체역가의범위는 1:16-1:1,28 이었으며 IgM-EIA 측정값의범위는 EIU/mL, IgG-EIA 측정값의범위는 EIU/mL 이었다. 2) 입자응집법의역가에따른 IgM 및 IgG EIA 의양성및음성판정 비교 입자응집법역가에따른 IgM-EIA 와의결과비교에서입자응집 법역가 1:16 에서 11 명중 2 명, 1:32 에서 3 명중 1 명, 1:64 에서 3 명중 3 명, 1:1,28 에서 1 명중 1 명이 IgM-EIA 양성결과를보였다. 따라서입자응집법양성역가에따른검사간결과일치율은각각 18.2%, 33.3%, 1%, 1% 이었다 (Table 2). 입자응집법역가에따른 IgG-EIA 와의결과비교에서입자응집 법역가 1:4 에서 3 명중 1 명, 1:8 에서 3 명중 1 명, 1:16 에서 11 명 중 11 명, 1:32 에서 3 명중 3 명, 1:64 에서 3 명중 3 명, 1:1,28 에서 2 명중 1 명, 1:2,56 에서 2 명중 1 명이 IgG-EIA 양성결과를보였다 (Table 2). 3) 전체환자의입자응집법과효소면역측정법간의불일치결과의 비교 총 23 명의환자가입자응집법과 IgG 또는 IgM EIA 간결과일치 율의비교에서불일치소견을보였다. 입자응집법음성환자에서입자응집법과효소면역측정법간의 불일치결과를보인총 6 명은모두 IgG-EIA 가양성이었고이들의 Table 2. Comparison between PA and IgM-EIA methods in the detection of MP specific antibodies stratified for PA antibody titers PA titer IgM-EIA IgG-EIA (N=26) Agreement* (N=35) Agreement* :4 NT NT NA :8 NT NT NA : : : :1, :2,56 NT NT NC Total *Agreement of positive and negative PA results with EIA results. Abbreviations: PA, particle agglutina MP, Mycoplasma pneumoniae; NT, not tested; NC, not available. 실제측정값의범위는 EIU/mL 였다. 반면이들은모두 IgM-EIA 가음성으로결과가일치하였다. 입자응집법양성환자에서입자응집법과효소면역측정법간의 불일치결과를보인환자총 17 명중입자응집법역가 1:4-1:8 에 서양성인환자 4 명은 IgG-EIA 가음성이었고 IgM-EIA 는시행하지 않아일치율을알수없었다. 입자응집법역가 1:16-1:32 에서양 성을보인환자 11 명은모두 IgM-EIA 가음성이었고반면 IgG-EIA 는모두양성으로결과가일치하였고이들의실제측정값의범위 는비교적높은 EIU/mL 였다. 또한, 입자응집법역가 1: 1,28 이상에서양성을보인환자 2 명은 IgG-EIA 음성으로결과 불일치하였고이들은 IgM-EIA 를시행하지않았다. 전체적으로두 검사법간의결과가불일치한환자들중 IgG 양성을보인환자는 11 명모두 IgM 음성이었다 (Table 3). 2. 입자응집법과 IgM 및 IgG EIA 간의상관관계 입자응집법의희석역가와 IgM 및 IgG EIA 측정값간의상관관 계비교에서입자응집법과 IgM-EIA 간의상관계수 r 은전체, 성인, 소아환자에서각각.729 (P <.1),.852 (P <.1),.584 (P = Table 3. Discordant results between PA and IgG or IgM EIA in the detection of MP specific antibodies PA titer IgG-EIA (EIU/mL)* IgM-EIA (EIU/mL)* Negative Positive (11) Negative (.2) Negative Positive (68.9) Negative (.14) Negative Positive (145) Negative (.14) Negative Positive (6.7) Negative (.32) Negative Positive (178) Negative (.34) Negative Positive (74.6) Negative (.46) 1:4 Negative (29.6) NT 1:4 Negative (29.9) NT 1:8 Negative (4.4) NT 1:8 Negative (11.4) NT 1:16 Positive (139) Negative (.13) 1:16 Positive (171) Negative (.2) 1:16 Positive (114) Negative (.21) 1:16 Positive (138) Negative (.23) 1:16 Positive (15) Negative (.39) 1:16 Positive (281) Negative (.4) 1:16 Positive (113) Negative (.44) 1:16 Positive (92.2) Negative (.55) 1:16 Positive (177) Negative (1.2) 1:32 Positive (62.8) Negative (.58) 1:32 Positive (141) Negative (.67) 1:1,28 Negative (34.4) NT 1:2,56 Negative (23.5) NT *Values above 1.1 EIU/mL for IgM-EIA and above 45 EIU/mL for IgG-EIA are interpreted as positive. Abbreviations: PA, particle agglutination assay; EIA, enzyme immunoassay; MP, Mycoplasma pneumoniae; NT, not tested

4 .59) 였고입자응집법과 IgG-EIA 간의상관계수 r은각각.32 (P =.7),.517 (P <.5),.842 (P <.1) 였다. 따라서입자응집법역가는성인에서 IgM-EIA 및 IgG-EIA 측정값과모두상관관계가있었으며소아에서는 IgG-EIA 측정값만이입자응집법역가와뚜렷한상관관계가있었다. 전체환자의입자응집법역가와 IgG-EIA 측정값간의상관관계분석에서 1:1,28 및 1:2,56 의높은입자응집법역가에서 IgG-EIA 음성을보인 2명의환자결과는상관관계분석에서제외하였다. 성인환자의입자응집법역가와 IgG-EIA 측정값간의상관관계분석에서는 1:2,56 의높은입자응집법역가에서 IgG-EIA 음성을보인한명의환자결과는상관관계분석에서제외하였다. 소아환자의입자응집법역가와 IgG-EIA 측정값간의상관관계분석에서는 1:1,28 및 1:2,56 의높은입자응집법역가에서 IgG-EIA 음성을보인 2명의환자결과는상관관계분석에서제외하였다 (Fig. 1). 고찰 본연구에서저자는입자응집법과효소면역측정법 (IgG, IgM) 을이용한폐렴미코플라스마특이항체검사를시행하여두검사법을비교하였다. 두검사법간의전체결과일치율, 입자응집법의역가에따른두검사법간의전체결과일치율을조사하고두검사법간의상관관계를각각전체, 성인, 소아환자에서나누어비교 하였다. 그결과저자가본연구에서관찰한바는다음과같다. 첫째, 입자응집법과 IgM 및 IgG EIA의결과일치율은각각예상보다낮은 57.7% 및 65.7% 였고두검사간일치척도 k는각각.281과.28 로매우낮았다. 특히 IgM은입자응집법과의상관관계가높은것으로알려져 [7] 있어결과일치율이높을것으로예상되었으나전체환자에서 IgG보다낮은결과일치율을보였다. 두검사간낮은일치율의원인으로는먼저저역가의입자응집법양성환자의다수는급성감염이아니므로 IgM 음성이며입자응집법음성환자중급성감염은아니지만, 과거감염덕분에면역을획득한환자들의 IgG 양성소견이본연구에다수포함된결과로생각된다. 또한양성입자응집법과효소면역측정법간결과일치율은 IgG (77.8%) 에서더높으며음성입자응집법과효소면역측정법간결과일치율은 IgG보다 IgM에서더높은양상을보였다. 둘째, IgM과입자응집법의결과일치율은입자응집법역가가증가할수록증가하는양상을보였으나 IgG는소아에서매우높은입자응집법역가에서오히려음성으로나타나불일치결과를보였다. 입자응집법과효소면역측정법의검사간비교에서결과불일치한경우를살펴보면입자응집법음성결과에서의결과불일치원인은주로 IgG-EIA였고 1:16 에서 1:32 사이의희석역가에서의불일치의원인은모두 IgM-EIA였으나그이상의고역가에서도 IgG-EIA가음성으로결과가불일치하였다. 불일치결과를보인환자중역가 1:1,28 의높은 IgG (EIU/mL) IgM (EIU/mL) y=.1x+.31 R= PA (titer) PA (titer) PA (titer) A B ,12 1,28 y=.169x R= IgG (EIU/mL) IgM (EIU/mL) y=.7x R= ,28 1,6 1,92 2,24 2,56 y=.1x+.774 R= PA (titer) PA (titer) PA (titer) D E IgM (EIU/mL) IgG (EIU/mL) y=.1x+.132 R= y=.374x R=.842 C , 1,2 1,4 F Fig. 1. Correlation between PA titer and EIA measured value in the detection of Mycoplasma pneumoniae specific antibodies. (A) between PA titer and IgM-EIA (P <.1). (B) between PA titer and IgG-EIA (P =.7). (C) between PA titer and IgM-EIA in adults (P <.1). (D) between PA titer and IgG-EIA in adults (P <.5). (E) between PA titer and IgM-EIA in children (P =.59). (F) between PA titer and IgG-EIA in children (P <.1). Abbreviations: PA, particle agglutination assay; EIA, enzyme immunoassay

5 역가를보인두환자는 IgG-EIA 양성일것으로예상했으나음성이었다. 본연구에서 IgM-EIA 양성환자는모두 IgG-EIA 양성소견을보인점을미루어짐작할때이들역시 IgM-EIA 음성일것으로예상되나확인할수없었다. 이러한소견은비록제한적인결과이지만고역가의양성입자응집법환자에서도 EIA 음성소견이나타날가능성이있음을시사한것이다. 이와비슷한현상은과거다른연구에서도나타났던것으로 Yoo 등이발표한내용에따르면입자응집법과 IgM-EIA와의높은상관관계에도불구하고높은역가 (1:1,28 이상 ) 의입자응집법양성검체중일부에서 IgM 음성결과가있었다 [7, 11]. 이들검체의경우같은검체에서높은 IgG 측정값을보였거나추적검사에서 IgM 양성전환이있었다. 셋째, 성인에서는입자응집법역가와 IgM 및 IgG 측정값사이의상관관계가모두통계적으로유의하였으나소아에서는입자응집법역가와 IgG 측정값사이의상관관계만이통계적으로유의하였다. 입자응집법을이용한 MP 감염진단은일반적으로양성역가 1:32 이상일때이루어진다. 그러나 Lee 등은과거연구에서호흡기증상을보이는소아에서의 MP 감염의진단율 (diagnostic power) 이더낮은역가인 1:16 에서최대라고보고한바있다 [12]. 따라서입자응집법이성인에서보다소아에서더민감할것으로생각되었고소아에서의입자응집법역가와 IgM 측정값사이의상관관계가성인에서보다높을것으로예상했으나소아에서의검사간상관관계는통계적으로유의하지않았다. 또한과거 Yoo 등이입자응집법역가와 IgM-EIA 간상관관계가높고결과일치율이높다고 [7] 발표하였는데저자들의연구에서는두검사법의일치율이낮게관찰되어상반된결과를보였다. 상반된결과의원인으로두연구에서각각다른검사키트를사용했던점과 Yoo의연구는모두소아를대상으로시행한반면본연구에는성인환자가포함된점등을추측할수있었다. 본연구에서는성인과소아모두에서입자응집법과효소면역측정법간결과일치율은낮았고입자응집법과 IgM-EIA 간상관관계는성인환자군에서높았으나소아환자에서는낮아 IgM 양성급성감염을진단할때입자응집법은성인에서보다덜유용할것으로생각되었다. 현재국내에서가장많이이용되고있는폐렴미코플라스마특이항체검사법은입자응집법과효소면역측정법이다. 입자응집법과효소면역측정법은각각검사의한계점과장점이잘알려져있다. 입자응집법은간편하면서도정량분석이가능하며역가에대한기존의임상자료들이축적되어 [13, 14] 있어이를이용한환자의진단과치료가용이한장점이있다. 그러나모든역가의단일양성입자응집법소견이임상적으로감염을의미하는것은아니며급성기위음성, 추적검사가필요하다는등의단점이있다. 효소면역측정법의경우 IgM 측정을통해급성감염을명확히진단할수있다는큰장점이있지만이역시위음성의위험이있다. 또한 IgM 음성시환자에대한임상적정보를전혀줄수없고환자의추적관찰시그유용성을뚜렷이알수없다. 본연구를통해비교해본두검사법은그일치율이낮아서로를대체하기에부족하다고생각된다. 이에검사실에서입자응집법과 IgM-EIA를동시에시행한다면진단및치료에유용할것으로생각된다. 그러나대부분의검사실에서는두검사법을모두도입하기에현실적인어려움이있어검사법을택일해야할것으로예상된다. 저자는효소면역측정법보다입자응집법을선택하는것이더적절할것으로생각하는데그이유는첫째, 폐렴미코플라스마특이항체검사의가장중요한임상적의미는급성감염의진단임을고려했을때전체환자의입자응집법과급성감염의지표인 IgM- EIA는서로상관관계가높아입자응집법과급성감염진단에충분히유용하고둘째, 입자응집법에대한과거축적된임상자료들이많으며셋째, 입자응집법은간편하면서도저렴하기때문이다. 다만, 소아환자의진단시입자응집법과 IgM-EIA 검사간상관관계는통계적으로유의하지않았음을고려해야할것이다. 그러나본연구에는몇가지제한점이있다. 첫째, 전체폐렴미코플라스마감염의심군을대표하기에대상환자수가적었고둘째, 소아환자가모두입자응집법양성으로입자응집법음성결과를효소면역측정법과비교할수없었고셋째, 일부환자들은 IgM을측정하지않아부분적으로 IgM과 IgG를비교하기에어려움이있었으며넷째, 입자응집법과효소면역측정법은결과를보고하는단위가달라직접적인정량적비교가어려운제한점이있었으며다섯째, 환자의검사결과만을조사하여최종진단명및예후를추적하지못했다는점등이그것이다. 그렇지만본연구를통해저자는폐렴미코플라스마특이항체검사중가장흔하게쓰이는입자응집법과효소면역측정법의검사간상관관계를비교하고성인과소아에서의차이를제한적으로나마비교하여본검사실에적합한검사법을제안할수있었다. 결론 결론적으로본연구에서조사된바로는입자응집법과효소면역측정법간결과일치율은전체, 성인, 소아모두에서낮았다. 더욱이두검사법은각각의장단점이뚜렷하여서로완전히대체하기에부족하다고생각된다. 또 IgG-EIA 측정은급성감염의진단에는다소임상적유용성이떨어진다. 따라서입자응집법과 IgM-EIA를동시에시행한다면서로보완적이라고생각된다. 그러나대부분의검사실에서는두검사법을모두도입하기에현실적인어려움이있을것이라고예상된다. 다행히입자응집법과급성감염의지표인 IgM-EIA는전체와성인환자에서서로상관관계가높고입자응집법에대한축적된임상자료가많으며비용적측면에서유리하므

6 로검사실에서입자응집법과효소면역측정법중택일해야한다면입자응집법이더적절할것으로생각된다. 요약 배경 : 폐렴미코플라스마에의한급성폐렴의조기진단을위한혈청학적검사로국내에서주로사용되는두방법은입자응집법과효소면역측정법을이용한 IgM 또는 IgG 측정검사법이다. 저자는입자응집법과효소면역측정법간검사일치율과상관관계를비교하여검사실에서유용한검사방법을제시하고자하였다. 방법 : 총 35명의환자를대상으로 MP 특이항체검사를입자응집법 (Serodia-Myco II, Fujirebio, Japan) 과효소면역측정법 (Ani Labsystems, Finland) 을사용해시행하였다. 대상환자중성인환자는 18명이었고소아환자는 17명이었다. 효소면역측정법은 IgM과 IgG 를구분하여검사하였다. 총 35명의환자중 26명은 IgM 및 IgG 검사를모두시행하였고 9명의환자는 IgG 검사만을시행하였다. 결과 : 본연구에서입자응집법과효소면역측정법의일치율은 IgM 과 IgG에서각각 57.7% 와 65.7% 였다. 입자응집법의양성결과는 IgG (77.8%) 보다 IgM (38.9%) 결과와더일치하였고입자응집법음성결과는 IgG (25%) 보다 IgM (1%) 과더일치하였다. 성인에서입자응집법의역가와 IgM (r =.852, P <.1) 및 IgG (r =.517, P <.5) 측정값사이의상관관계와소아환자에서입자응집법의역가와 IgG (r =.842, P <.1) 측정값사이의상관관계가통계적으로유의하였다. 결론 : 본연구에서저자들은입자응집법과효소면역측정법이서로대체될수없음을관찰하였다. 따라서검사실에서입자응집법과 IgM 효소면역측정법을동시에시행하는것이가장이상적일것으로생각된다. 그러나검사실에서두검사법중택일해야한다면입자응집법이폐렴미코플라스마급성감염을진단하는데더유용할것으로생각된다. 참고문헌 1. Kim JW, Seo SK, Yoo EG, Park SJ, Yoon SH, Jung HY, et al. Mycoplasma pneumoniae pneumonia in Korean children, from 1979 to 26-a meta-analysis. Korean J Pediatr 29;52: Csabi G, Komaromy H, Hollody K, Transverse myelitis as a rare, serious complication of Mycoplasma pneumoniae infection. Pediatr Neurol 29;41: Smith R and Eviatar L. Neurologic manifestations of Mycoplasma pneumoniae infections: diverse spectrum of diseases. A report of six cases and review of the literature. Clin Pediatr (Phila) 2;39: Myers PO, Khabiri E, Greub G, Kalangos A. Mycoplasma hominis mediastinitis after acute aortic dissection repair. Interact Cardiovasc Thorac Surg 21;11: Nagashima M, Higaki T, Satoh H, Nakano T. Cardiac thrombus associated with Mycoplasma pneumoniae infection. Interact Cardiovasc Thorac Surg 21;11: Shin YH, Lee BC, Song TW, Kim KW, Lee KE, Kim ES, et al. Diagnostic availability of PCR and ELISA in Mycoplasma pneumoniae Pneumonia. Pediatr Allergy Respir Dis (Korea) 26;16: Yoo SJ, Oh HJ, Shin BM. Evaluation of Four Commercial IgG- and IgMspecific Enzyme Immunoassays for Detecting Mycoplasma pneumoniae Antibody: Comparison with Particle Agglutination Assay. J Korean Med Sci 27;22: Block S, Hedrick J, Hammerschlag MR, Cassell GH, Craft JC. Mycoplasma pneumoniae and Chlamydia pneumoniae in pediatric community-acquired pneumonia: comparative efficacy and safety of clarithromycin vs. erythromycin ethylsuccinate. Pediatr Infect Dis J 1995;14: Waites KB and Talkington DF. Mycoplasma pneumoniae and Its Role as a Human Pathogen. Clinical Microbiology Reviews 24;17: Kim HJ, Nam SY, Yoon HS, Kim WK. Correlation between the diagnostic validity of enzymeimmunoassay and the hyperreactivity of the respiratory tract for the diagnosis of Mycoplasma pneumoniae. Pediatr Allergy Respir Dis (Korea) 27;17: Barker CE, Sillis M, Wreghitt TG. Evaluation of Serodia Myco II particle agglutination test for detecting Mycoplasma pneumoniae antibody: comparison with mu-capture ELISA and indirect immunofluorescence. J Clin Pathol 199;43: Lee EY, Lee DJ, Lee JA, Kim SW, Chang MW. Comparison of PCR, Culture and Serologic Tests for Diagnosis of Mycoplasma pneumoniae Infection. Pediatr Allergy Respir Dis 25;15: McCornik DP, Wenzel RP, Senterfit LB, Beam WE Jr. Relationship of pre-existing antibody to subsequent infection by Mycoplasma pneumoniae in adults. Infect Immunol 1974;1: Theile A, Karg O, Wex P, Muller KM. Bronchiolitis obliterans after Mycoplasma pneumonia. Pneumologie 1994;48:

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