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Articles of Significant Interest in This Issue

机译：本期重大关注文章

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Fresh produce is an important vehicle for transmission of Escherichia coli O157:H7, but less is known about factors that could impact bacterial colonization potential and persistence, such as bacterial growth rates, biofilm formation, and plant metabolites. Here Merget and colleagues (e00123-19) show a positive relationship between bacterial growth rates in plant extracts and living plants for sprouted seeds, including alfalfa and fenugreek, but not for leafy vegetables, such as lettuce and spinach. Therefore, variability at the level of the bacterial isolate, plant species, and tissue type all need to be considered in produce risk assessment.Stream headwaters supply bacterial diversity for all downstream sites; however, the spatiotemporal dynamics of headwater microbial communities is underexplored. In two time series studies of microbial community composition in a headwater stream, Teachey et al. (e00188-19) showed that microbial diversity rapidly decreased along the length of the stream, accompanied by consistent enrichment of select freshwater-associated microbial taxa that continued to dominate downstream environments. These trends were repeatable at time scales of days to a year. This work suggests that headwater streams act as dynamic, selective filters that supply a stable set of microbial taxa to the greater watershed.
机译：新鲜农产品是大肠杆菌O157：H7传播的重要媒介，但对影响细菌定殖潜力和持久性的因素（例如细菌生长速率，生物膜形成和植物代谢产物）知之甚少。在这里，Merget及其同事（e00123-19）显示出对于苜蓿和胡芦巴等发芽种子，植物提取物和活植物中细菌生长速率之间存在正相关关系，而对于莴苣和菠菜等多叶蔬菜则没有。因此，在生产风险评估中都需要考虑细菌分离物，植物种类和组织类型水平的变异性。然而，对源水微生物群落的时空动态研究不足。在两个时间序列研究上游水源中微生物群落组成的过程中，Teachey等人。 （e00188-19）表明，微生物多样性沿流的长度迅速减少，伴随着持续主导下游环境的精选淡水相关微生物类群的持续富集。这些趋势在几天到一年的时间范围内都是可重复的。这项工作表明，源头水流起着动态的，选择性的过滤器的作用，可以为更大的流域提供稳定的微生物分类群。

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