Lab Med Online.  2012 Jan;2(1):41-46. 10.3343/lmo.2012.2.1.7.

The Comparison between Particle Agglutination Assay and Enzyme Immunoassay in the Detection of Mycoplasma pneumoniae-Specific Antibody

Affiliations
  • 1Department of Laboratory Medicine, Hanyang University Medical Center, Seoul, Korea. lhchun@hanyang.ac.kr

Abstract

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 (100%) than IgG EIA results (25%). In adult patients, the correlation between PA titers and IgM (r=0.852, P <0.01) and IgG values (r=0.517, P <0.05) were statistically significant. In pediatric patients, the correlation between PA titers and IgG values (r=0.842, P <0.01) 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.

Keyword

Mycoplasma pneumoniae; Particle agglutination; Enzyme immunoassay

MeSH Terms

Adult
Agglutination
Antibodies
Humans
Immunoenzyme Techniques
Immunoglobulin G
Immunoglobulin M
Mycoplasma
Mycoplasma pneumoniae
Pneumonia
Pneumonia, Mycoplasma
Serologic Tests
Antibodies
Immunoglobulin G
Immunoglobulin M

Figure

  • 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<0.01). (B) between PA titer and IgG-EIA (P=0.07). (C) between PA titer and IgM-EIA in adults (P<0.01). (D) between PA titer and IgG-EIA in adults (P<0.05). (E) between PA titer and IgM-EIA in children (P=0.059). (F) between PA titer and IgG-EIA in children (P<0.01). Abbreviations: PA, particle agglutination assay; EIA, enzyme immunoassay.


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