1887

Abstract

The oral cavity has been implicated as a source of infection in childhood. Various PCR methods have been used to detect DNA in oral specimens with various detection rates reported. Such disparity in detection rates complicates the estimation of the true infection rate of in the oral cavity. In the present study, we constructed a novel PCR system for detection and used it to analyse oral specimens. Firstly, the nucleotide alignments of genes commonly used for detection were compared using the complete genome information for 48 strains registered in the GenBank database. Candidate primer sets with an estimated amplification size of approximately 300–400 bp were selected, and the specificity and sensitivity of the detection system using each primer set were evaluated. Five sets of primers targeting were considered appropriate, of which a single primer set was chosen for inclusion in the PCR system. The sensitivity of the system was considered appropriate and its detection limit established as one to ten cells per reaction. The novel PCR system was used to examine distribution in oral specimens (40 inflamed pulp tissues, 40 saliva samples) collected from Japanese children, adolescents and young adults. PCR analysis revealed that the detection rate of in inflamed pulp was 15 %, whereas no positive reaction was found in any of the saliva specimens. Taken together, our novel PCR system was found to be reliable for detecting . The results obtained showed that was detected in inflamed pulp but not saliva specimens, indicating that an infected root canal may be a reservoir for .

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2015-01-01
2024-12-08
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