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FeedsFarm.com > Volume 194, number 12: Antibiotic Selection May Contribute to Increases in Macrolide-Resistant Treponema pallidum

Volume 194, number 12: Antibiotic Selection May Contribute to Increases in Macrolide-Resistant Treponema pallidum

14th Nov 2006, 00:59 GMT

To determine whether the 23S rRNA mutation that confers macrolide resistance is present in >1 Treponema pallidum strain, 58 isolates collected between 2001 and 2005 were screened for this mutation and for an unrelated sequence that distinguishes between strains. The odds of identifying a macrolide-resistant strain increased over time ([FORMULA]). In subjects who had received macrolides in the previous year, the relative risk of harboring a resistant strain was 2.2 (95% confidence interval, 1.1–4.4; [FORMULA]). The macrolide-resistant strains were not identical. These findings suggest that macrolide resistance may be increasing in multiple strains in response to antibiotic pressure.

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