GET, Université de Toulouse, CNRS, IRD, UPS, Toulouse, France.
Faculty of Environmental Sciences, National University of Laos, Vientiane, Lao PDR.
Sci Rep. 2022 May 23;12(1):8674. doi: 10.1038/s41598-022-12795-0.
The environmental distribution of Burkholderia pseudomallei, the causative agent of melioidosis, remains poorly understood. B. pseudomallei is known to have the ability to occupy a variety of environmental niches, particularly in soil. This paper provides novel information about a putative association of soil biogeochemical heterogeneity and the vertical distribution of B. pseudomallei. We investigated (1) the distribution of B. pseudomallei along a 300-cm deep soil profile together with the variation of a range of soil physico-chemical properties; (2) whether correlations between the distribution of B. pseudomallei and soil physico-chemical properties exist and (3) when they exist, what such correlations indicate with regards to the environmental conditions conducive to the occurrence of B. pseudomallei in soils. Unexpectedly, the highest concentrations of B. pseudomallei were observed between 100 and 200 cm below the soil surface. Our results indicate that unravelling the environmental conditions favorable to B. pseudomallei entails considering many aspects of the actual complexity of soil. Important recommendations regarding environmental sampling for B. pseudomallei can be drawn from this work, in particular that collecting samples down to the water table is of foremost importance, as groundwater persistence appears to be a controlling factor of the occurrence of B. pseudomallei in soil.
布氏杆菌 pseudomallei 的环境分布仍知之甚少,布氏杆菌 pseudomallei 是类鼻疽病的病原体,已知其具有占据多种环境小生境的能力,特别是在土壤中。本文提供了关于土壤生物地球化学异质性和布氏杆菌 pseudomallei 垂直分布之间可能存在关联的新信息。我们调查了(1)沿 300 厘米深土壤剖面的布氏杆菌 pseudomallei 分布情况以及一系列土壤物理化学性质的变化;(2)布氏杆菌 pseudomallei 的分布与土壤物理化学性质之间是否存在相关性;以及(3)如果存在相关性,这些相关性表明了哪些与土壤中布氏杆菌 pseudomallei 发生相关的环境条件。出乎意料的是,在土壤表面以下 100 至 200 厘米处观察到布氏杆菌 pseudomallei 的浓度最高。我们的结果表明,要揭示有利于布氏杆菌 pseudomallei 的环境条件,就需要考虑土壤实际复杂性的许多方面。可以从这项工作中得出关于布氏杆菌 pseudomallei 环境采样的重要建议,特别是采集地下水层以下的样本至关重要,因为地下水的持续存在似乎是控制布氏杆菌 pseudomallei 在土壤中发生的因素。