Characterization of Legionella Species from Watersheds in British Columbia, Canada
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Characterization of Legionella Species from Watersheds in British Columbia, Canada

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      spp. present in some human-made water systems can cause Legionnaires' disease in susceptible individuals. Although legionellae have been isolated from the natural environment, variations in the organism's abundance over time and its relationship to aquatic microbiota are poorly understood. Here, we investigated the presence and diversity of legionellae through 16S rRNA gene amplicon and metagenomic sequencing of DNA from isolates collected from seven sites in three watersheds with varied land uses over a period of 1 year. | spp. were found in all watersheds and sampling sites, comprising up to 2.1% of the bacterial community composition. The relative abundance of | tended to be higher in pristine sites than in sites affected by agricultural activity. The relative abundance levels of |, some of which are natural hosts of legionellae, were similarly higher in pristine sites. Compared to other bacterial genera detected, | had both the highest richness and highest alpha diversity. Our findings indicate that a highly diverse population of legionellae may be found in a variety of natural aquatic sources. Further characterization of these diverse natural populations of | will help inform prevention and control efforts aimed at reducing the risk of | colonization of built environments, which could ultimately decrease the risk of human disease. | Many species of | can cause Legionnaires' disease, a significant cause of bacterial pneumonia. | in human-made water systems such as cooling towers and building plumbing systems are the primary sources of Legionnaires' disease outbreaks. In this temporal study of natural aquatic environments, | relative abundance was shown to vary in watersheds associated with different land uses. Analysis of the | sequences detected at these sites revealed highly diverse populations that included potentially novel | species. These findings have important implications for understanding the ecology of | and control measures for this pathogen that are aimed at reducing human disease.
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