Abstract
Legionella pneumophila, a micro-organism encountered in aquatic environments, can cause serious intracellular infections among humans. Since the bacterium is ubiquitous in aquatic habitats, it appears to be impossible to prevent L. pneumophila from entering man-made water systems. However, many questions concerning the survival and/or growth in the environment, the partners and opponents of L. pneumophila remain unanswered. This review focuses on the factors governing the ecology of L. pneumophila, since there is considerable divergence and even contradiction in literature on its environmental requirements. A key question to be resolved is the discrepancy between the fastidious nature of L. pneumophila in axenic cultures (e.g. 400 mg l−1 L-cysteine and 250 mg l-1 ferric iron) and the nutritionally poor environments in which it is commonly detected. It is assumed that dense microbial communities, as occurring in sediments and biofilms – but not likely in surface and drinking water, – can provide the necessary growth requirements for L. pneumophila. However, most of the studies concerning L. pneumophila have led to the general opinion that the organism can only multiply in the aquatic environment as a parasite in certain protozoa. The discovery of the non-classical siderophore legiobactin also indicates that the iron requirement for survival and autonomous growth is not as high as has been assumed. It thus appears that in order to control Legionella in the environment, focus should be on the eradication of microbial hotspots in which L. pneumophila resides.
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Devos, L., Boon, N. & Verstraete, W. Legionella pneumophila in the Environment: The Occurrence of a Fastidious Bacterium in Oligotrophic Conditions. Rev Environ Sci Biotechnol 4, 61–74 (2005). https://doi.org/10.1007/s11157-004-8174-1
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DOI: https://doi.org/10.1007/s11157-004-8174-1