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. 1990 Sep;28(9):2087–2093. doi: 10.1128/jcm.28.9.2087-2093.1990

Diagnosis of Mycoplasma pneumoniae pneumonia: sensitivities and specificities of serology with lipid antigen and isolation of the organism on soy peptone medium for identification of infections.

G E Kenny 1, G G Kaiser 1, M K Cooney 1, H M Foy 1
PMCID: PMC268108  PMID: 2121791

Abstract

The sensitivities and specificities of isolation and serology for detection of Mycoplasma pneumoniae infections were determined for 3,546 pneumonia patients for whom both isolation and serological data were available. Soy peptone, fresh yeast extract, horse serum-supplemented agar, and diphasic medium were employed for isolation, and the lipid antigen of M. pneumoniae was used for serodiagnosis by complement fixation. The number of M. pneumoniae colonies most frequently detected was 200 to 600 per throat swab, with a range of less than or equal to 60 to greater than or equal to 2,000. The use of diphasic medium increased the number of isolates by 26% compared with direct isolation on agar plates. The organism was isolated from 360 of 525 patients who showed fourfold or greater antibody increases in their paired sera, resulting in a sensitivity of culture of 68%. When persons with titers of greater than or equal to 32 but no fourfold increase were used as the reference, the sensitivity of culture was 58%. The combined sensitivity of the culture method for persons with serological evidence of infection (fourfold increase and titer of greater than or equal to 32) was 64%. The specificity of the culture method was 97% for the 2,527 serologically negative persons. Fourfold antibody increases were found in 360 of 674 persons with isolates of the organism, resulting in a sensitivity of 53%. An additional 247 persons showed titers of greater than or equal to 32 (without a fourfold increase), resulting in a combined sensitivity of 90% for serology with the lipid antigen for the detection of antibodies in culture-positive persons. Fourfold antibody increases were found in 6% of culture-negative persons, resulting in a specificity of 94%. The quantitative culture results provide important base-line data for the development of rapid diagnostic tests for M. pneumoniae infection.

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Selected References

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