回归敏感性解释了在医院病原体中抵抗性的有限传播
Kevin C Tracy1, Jordan McKaig2, Clare Kinnear3
1Department of Computational Medicine and Bioinformatics, University of Michigan.
医院细菌发展出对抗生素的耐药性. 当抗生素压力被消除时,高水平的耐药性可以迅速下降,这可能会限制医疗保健机构中耐药菌株的传播.
科学领域:
- 微生物学 微生物学
- 进化生物学 进化生物学
- 传染性疾病 传染性疾病
背景情况:
- 医院中的细菌病原体面临着抗生素暴露的波动,必须在患者之间传播.
- 医院中抗生素耐药性的增加是一个重大的公共卫生问题.
- 在没有选择性压力的情况下,抗生素耐药性的丧失是耐药性动态的一个研究不足的方面.
研究的目的:
- 为了研究一种假设,即高成本的抗生素耐药性在抗生素压力被消除时更快地恢复到敏感性.
- 为了比较daptomycin耐药性的稳定性,新出现的Enterococcus faecium与假定被传播的相比.
主要方法:
- 使用了一组多样化的患者衍生,抗达普托素的*Enterococcus faecium*分离物.
- 与具有 * de novo * 耐药性出现的菌株与具有假定传播耐药性的菌株进行了比较.
- 允许耐药菌株在无抗生素实验室条件下进化,并对已进化的分离物进行了测序.
主要成果:
- 假定传播的耐药菌株通常具有较低的耐药性水平,但在无抗生素条件下耐药性损失最小.
- * de novo * 耐药菌株表现出更高的耐药性水平,但耐药性 * in vitro * 的下降更大.
- 高级抗性的逆转与与抗性突变相关的特定进化途径有关,表明可访问的健身权衡.
结论:
- 通过可访问的进化途径,当抗生素压力被移除时,E. faecium中高水平抗生素耐药性的快速丧失可以发生.
- 这种快速逆转可能会限制某些耐药菌株在医院内的传播.
- 耐药性丧失的动态塑造了在患者中观察到的耐药性表型的多样性.
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