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  • Title: The association between erythromycin monotherapy for Mycobacterium avium complex lung disease and cross-resistance to clarithromycin: A retrospective case-series study.
    Author: Hosono Y, Kitada S, Yano Y, Mori M, Miki K, Miki M, Yoshimura K, Kagawa H, Oshitani Y, Yokota S.
    Journal: J Infect Chemother; 2018 May; 24(5):353-357. PubMed ID: 29361415.
    Abstract:
    Long-term, low-dose erythromycin monotherapy, based on the anti-inflammatory effects of macrolides, has been reported to have the potential to suppress the exacerbation of Mycobacterium avium complex (MAC) lung disease with less toxicity. It remains unclear whether erythromycin monotherapy induces cross-resistance to clarithromycin, a key drug for MAC. To clarify this point, we conducted a retrospective, single-center, case-series study on patients with MAC lung disease who underwent erythromycin monotherapy for at least 6 months. Drug susceptibility tests, before and after erythromycin treatment initiation, were analyzed. Thirty-three patients were included in our study. All 33 patients showed susceptibility to clarithromycin for MAC both before and after erythromycin monotherapy. There was no significant difference in clarithromycin minimum inhibitory concentrations between before and after erythromycin treatment (median difference = 0 μg/ml; P = .313, Wilcoxon's signed-rank test). We conclude that erythromycin monotherapy for MAC lung disease may not induce cross-resistance to clarithromycin.
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