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Environmental factors affecting the survival of soil dwelling Legionella longbeachae in water

Marija Dijan 1,  
Danica RebiĆ 1,  
 
1
Department of Microbiology and Parasitology, Faculty of Medicine, University of Rijeka, Croatia
Ann Agric Environ Med 2016;23(3):452–455
KEYWORDS:
ABSTRACT:
[b]Introduction. [/b][i]Legionella longbeachae[/i], a causative agent of Legionnaire’s disease, has often been associated with potting soil and gardening, a feature quite distinct from other [i]Legionella[/i] species. The precise transmission mechanism is still unknown, although due to the ecological coherence of the soil and water there is a potential risk of infection by contaminated stagnant water in the garden. [b]Objective.[/b] The aim of the study was to explore the ability of [i]L. longbeachae[/i] to survive in stagnant tap water usually used for watering in gardens. The influence of different factors (temperature, pH and NaCl concentration) on [i] L. longbeachae [/i]survival in stagnant tap water was also tested. [b]Results. [/b]The result showed that [i]L. longbeachae[/i] is viable in stagnant tap water over 100 days at 4 °C and 25 °C. The survival of [i]L. longbeachae[/i] exposed to different pH and NaCl concentration suggests resistance to low pH values (pH2 and pH5) and all tested NaCl concentrations at temperatures lower than 25 °C. The ability of [i]L. longbeachae[/i] to persist in stagnant tap water should be taken seriously in the risk assessments as a possible hidden reservoir of infection.
eISSN:1898-2263
ISSN:1232-1966