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Prevalence of Mycoplasma genitalium and mutations associated with macrolide and fluoroquinolone resistance in Finland

The aim was to examine the prevalence of Mycoplasma genitalium and to determine the prevalence of mutations leading to resistance to macrolides and fluoroquinolones in a sexually transmitted infection clinic setting in Finland, and as a service evaluation, to validate the performance of a commercial Aptima® Mycoplasma genitalium assay. Urogenital samples were studied for M. genitalium with an automated commercial Aptima® Mycoplasma genitalium assay on the Panther® system (Hologic), and with an in-house real-time polymerase chain reaction (PCR) (mgpB). Positive specimens were further studied for mutations associated with macrolide resistance within the 23S rRNA gene and the known quinolone resistance-determining regions within genes gyrA, gyrB and parC. Altogether 17/303 (5.6%) of samples contained M. genitalium by either test. Two of the samples positive by the Aptima assay were not detected by the in-house PCR assay, although the internal control (beta-globin gene) was amplified. The Aptima assay gave an invalid result for five samples, all of which were negative by the in-house PCR. Mutations resulting in macrolide resistance were detected in 30.8% of M. genitalium-positive specimens. Prevalence of M. genitalium infections in the specimens tested is similar to that in other parts of Europe, 5.6%. The Aptima® Mycoplasma genitalium assay detected slightly more positives than the in-house PCR assay. Mutations resulting in macrolide resistance were common in M. genitalium and detection of these mutations is recommended in diagnostic laboratories to assist in selection of treatment.