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首页> 美国卫生研究院文献>Applied and Environmental Microbiology >Pathogenic Escherichia coli Found in Sewage Treatment Plants and Environmental Waters
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Pathogenic Escherichia coli Found in Sewage Treatment Plants and Environmental Waters

机译：在污水处理厂和环境水域发现致病性大肠杆菌

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We previously demonstrated that some Escherichia coli strains with uropathogenic properties survived treatment stages of sewage treatment plants (STPs), suggesting that they may be released into the environment. We investigated the presence of such strains in the surrounding environmental waters of four STPs from which these persistent strains were isolated. In all, 264 E. coli isolates were collected from 129 receiving water sites in a 20-km radius surrounding STPs. We also included 93 E. coli strains collected from 18 animal species for comparison. Isolates were typed using a high-resolution biochemical fingerprinting method (the PhPlate system), and grouped into common (C) types. One hundred forty-seven (56%) environmental isolates were identical to strains found in STPs' final effluents. Of these, 140 (95%) carried virulence genes (VGs) associated with intestinal pathogenic E. coli (IPEC) or uropathogenic E. coli (UPEC) and were found in a variety of sites within areas sampled. Of the remaining 117 environmental strains not identical to STP strains, 105 belonged to 18 C types and 102 of them carried VGs found among IPEC or UPEC strains. These strains belonged mainly to phylogenetic groups A (A0 and A1) and B1 and to a lesser extent B22, B23, D1, and D2. Eight of 18 environmental C types, comprising 50 isolates, were also identical to bird strains. The presence of a high percentage of environmental E. coli in waters near STPs carrying VGs associated with IPEC and UPEC suggests that they may have derived from STP effluents and other nonpoint sources.
机译：我们先前证明了一些具有尿毒症性质的大肠杆菌菌株在污水处理厂（STP）的处理阶段中幸存下来，这表明它们可能会释放到环境中。我们调查了在四个STP的周围环境水中这种菌株的存在，从中分离了这些持久性菌株。总共从STP周围20公里半径内的129个接收水站点收集了264株大肠杆菌。我们还包括从18种动物中收集的93株大肠杆菌进行比较。使用高分辨率生化指纹图谱方法（PhPlate系统）对分离株进行分型，并分为常见的（C）类型。一百四十七（56％）个环境分离物与污水处理厂最终污水中发现的菌株相同。其中140（95％）个携带与肠道致病性大肠杆菌（IPEC）或泌尿致病性大肠杆菌（UPEC）相关的毒力基因（VG），并在采样区域内的多个地点发现。在其余117种与STP菌株不同的环境菌株中，有105种属于18 C型，其中102种带有IPEC或UPEC菌株中的VG。这些菌株主要属于系统发育组A（A0和A1）和B1，次要程度属于B22，B23，D1和D2。 18种环境C型中的8种，包括50种分离株，也与禽类相同。在带有与IPEC和UPEC相关的VG的STP附近的水域中存在高百分比的环境大肠杆菌，这表明它们可能源自STP废水和其他非点源。

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