Pathology and Biomedical Science, University of Otago, 2 Riccarton Avenue, Christchurch 8011, New Zealand.
Department of Population Health, University of Otago, 34 Gloucester Street, Christchurch 8013, New Zealand.
Lett Appl Microbiol. 2024 Sep 2;77(9). doi: 10.1093/lambio/ovae081.
Legionella longbeachae is the leading cause of Legionnaires' disease (LD) in Australasia and has been linked to exposure to compost and potting soils. Adding antimicrobial metal ions such as copper (Cu2+), zinc (Zn2+), and manganese (Mn2+) to potting soils may reduce the load of L. longbeachae bacteria and infection risk. Baseline concentrations of metal ions in leachate from peat, bark dust, bagging base, and an all-purpose potting soil were: iron 0.40-0.99 µg/ml, Cu of 0.003-0.03 µg/ml, Zn 0.01-0.06 µg/ml and Mn 0.11-0.29 µg/ml. Addition of Cu2+ ions to leachate reduced L. longbeachae viability in a concentration dependent manner. A similar effect was seen in potting soil with Zn2+ and Mn2+ but 10-fold higher concentrations were needed. These metal ions have potential to reduce the load of L. longbeachae in potting soils but toxicity in plants needs to be determined.
长滩军团菌是澳大拉西亚地区军团病（LD）的主要病原体，与接触堆肥和盆栽土壤有关。向盆栽土壤中添加铜（Cu2+）、锌（Zn2+）和锰（Mn2+）等抗菌金属离子可能会降低长滩军团菌的细菌负荷和感染风险。从泥炭、树皮尘埃、袋装基质和通用盆栽土的淋出液中，基线金属离子浓度分别为：铁 0.40-0.99µg/ml、铜 0.003-0.03µg/ml、锌 0.01-0.06µg/ml 和锰 0.11-0.29µg/ml。向淋出液中添加 Cu2+离子会以浓度依赖的方式降低长滩军团菌的活力。在添加 Zn2+和 Mn2+的盆栽土壤中也观察到了类似的效果，但需要高 10 倍的浓度。这些金属离子有可能降低盆栽土壤中长滩军团菌的负荷，但需要确定其对植物的毒性。
