与其他细菌相比,嗜水气单胞菌在淡水和贫营养水中的生存潜力。

I Kersters, G Huys, H Van Duffel, M Vancanneyt, K Kersters, W Verstraete
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引用次数: 65

摘要

用活菌计数法研究了一种基因标记的嗜水气单胞菌菌株在水微生物中的存活。研究表明,嗜水气单胞菌AWWX1在四种经过过滤的高压灭菌淡水(地表水和地下水)中的三种以及所有经过过滤的高压灭菌的营养贫乏的水(瓶装泉水、milliq和自来水)中存活至少10天,而活菌数量没有下降。然而,在未经过滤的水中,Aer的活菌数量迅速下降。1 ~ 5 d后观察嗜水菌AWWX1的存活情况。在营养贫乏的水体中,将嗜水菌AWWX1与荧光假单胞菌P17和螺旋菌NOX进行比较。生存特征依赖于生物和水。在过滤后的高压水中,螺旋藻菌株NOX的活菌数比Aer高1 log-unit。亲水性蛋白AWWX1和荧光蛋白P17。测试的菌株是。亲水菌AWWX1和Ps. fluorescens P17在过滤后的高压灭菌水中的存活率分别为3 ~ 20倍,是未过滤水的2 ~ 4倍。显然,这些微生物适应低营养环境的任何固有能力都被本地微生物群的存在所破坏。目前的研究结果表明:嗜水菌在几种饮用水中的存活能力非常差,这对公众健康至关重要,并引发了有关其机制的问题。
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Survival potential of Aeromonas hydrophila in freshwaters and nutrient-poor waters in comparison with other bacteria.

The survival of a genetically-marked Aeromonas hydrophila strain was studied in water microcosms using viable counts. Aeromonas hydrophila AWWX1 was shown to survive without decline in viable counts for at least 10 d in three of four filtered-autoclaved freshwaters (surface water and groundwater) and in all examined filtered-autoclaved nutrient-poor waters (bottled spring water, Milli-Q and tap water). However, in the unfiltered waters, a rapid decrease in viable counts of Aer. hydrophila AWWX1 was observed after 1-5 d. The survival of Aer. hydrophila AWWX1 in nutrient-poor waters was compared with that of Pseudomonas fluorescens P17 and Spirillum strain NOX. Survival characteristics were organism- and water-dependent. In the filtered-autoclaved waters, viable counts of Spirillum strain NOX were ca 1 log-unit higher than for Aer. hydrophila AWWX1 and Ps. fluorescens P17. The tested strains Aer. hydrophila AWWX1 and Ps. fluorescens P17 survived 3 to 20, respectively 2 to 4 times better in the filtered-autoclaved waters compared to the unfiltered waters. Apparently, any inherent capability of these micro-organisms to adapt to low-nutrient environments was undone by the presence of the autochthonous microbiota. The present findings that Aer. hydrophila survives very poorly in several drinking waters is of utmost importance towards public health and arises questions about the mechanisms involved.

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