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Journal of Clinical Microbiology logoLink to Journal of Clinical Microbiology
. 1994 Nov;32(11):2667–2670. doi: 10.1128/jcm.32.11.2667-2670.1994

Comparison of PCR assay with bacterial culture for detecting Streptococcus pneumoniae in middle ear fluid of children with acute otitis media.

A Virolainen 1, P Salo 1, J Jero 1, P Karma 1, J Eskola 1, M Leinonen 1
PMCID: PMC264139  PMID: 7852553

Abstract

We have studied etiological diagnosis of acute otitis media (AOM) by comparing a newly developed pneumococcal PCR for Streptococcus pneumoniae to bacterial culture with 180 middle ear fluid (MEF) samples of 125 children with 125 episodes of AOM. For pneumococcal PCR assay, DNA from MEF samples was extracted by phenol-chloroform. The outer primers used amplified a 348-bp region of the pneumolysin gene, and the inner primers amplified a 208-bp region. S. pneumoniae was cultured in 33 (18%) samples, and pneumolysin PCR was positive for 51 (28%) of 180 MEF samples. Only 2 of 21 PCR-positive, S. pneumoniae culture-negative samples were positive for other otitis pathogens. By combining MEF culture and PCR results, 54 (30%) of 180 MEF samples had evidence of pneumococcal etiology. In conclusion, pneumolysin PCR is a sensitive and specific new method to study pneumococcal involvement in MEF samples of children with AOM.

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Selected References

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