Williams A P, Avery L M, Killham K, Jones D L
School of Agricultural and Forest Sciences, University of Wales, Bangor, Gwynedd, UK.
J Appl Microbiol. 2007 Feb;102(2):319-26. doi: 10.1111/j.1365-2672.2006.03104.x.
To assess whether the persistence of Escherichia coli O157:H7 in soil amended with cattle slurry and ovine stomach content waste is affected by the presence of a maize rhizosphere.
Cattle slurry and ovine stomach content waste were inoculated with E. coli O157:H7. Wastes were then applied to soil cores with and without established maize plants. The pathogen survived in soil for over 5 weeks, although at significantly greater numbers in soil receiving stomach content waste in comparison to cattle slurry. Persistence of the pathogen in soil was unaffected by the presence of a rhizosphere.
Other factors may be more influential in regulating E. coli O157:H7 persistence in waste-amended soil than the presence or absence of a rhizosphere; however, waste type did have significant affect on the survival of E. coli O157:H7 in such soil.
Escherichia coli O157:H7 can be present within animal-derived organic wastes that are routinely spread on land. Introduced measures with regards to such waste disposal may decrease exposure to the organism; however, the persistence of E. coli O157:H7 for considerable periods in waste-amended soil may still pose some risk for both human and animal infection. This study has shown that whilst survival of E. coli O157:H7 in waste-amended soil is not significantly affected by the presence or absence of a maize rhizosphere; it may vary significantly with waste type. This may have implications for land and waste management.
评估用牛粪浆和羊胃内容物废弃物改良的土壤中，大肠杆菌O157:H7的持久性是否受玉米根际的影响。
用大肠杆菌O157:H7接种牛粪浆和羊胃内容物废弃物。然后将废弃物施用于有和没有已定植玉米植株的土芯。该病原体在土壤中存活超过5周，尽管与牛粪浆相比，在接受胃内容物废弃物的土壤中数量显著更多。病原体在土壤中的持久性不受根际存在与否的影响。
在调节废弃物改良土壤中大肠杆菌O157:H7的持久性方面，其他因素可能比根际的存在与否更具影响力；然而，废弃物类型确实对大肠杆菌O157:H7在这种土壤中的存活有显著影响。
大肠杆菌O157:H7可能存在于常规施用于土地的动物源有机废弃物中。针对此类废弃物处理采取的措施可能会减少与该生物体的接触；然而，大肠杆菌O157:H在废弃物改良土壤中长时间的持久性仍可能对人类和动物感染构成一些风险。本研究表明，虽然大肠杆菌O157:H7在废弃物改良土壤中的存活不受玉米根际存在与否的显著影响；但它可能因废弃物类型而有显著差异。这可能对土地和废弃物管理有影响。
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