This work was carried out at the School of Life Sciences at the University of West England, UK and the Center for Infectious Disease Dynamics at Penn State University, USA.
Use of bioluminescent bacterial biosensors to investigate the role of free-living helminths as reservoirs and vectors of Salmonella
Article first published online: 28 APR 2009
© 2009 Society for Applied Microbiology and Blackwell Publishing Ltd
Environmental Microbiology Reports
Volume 1, Issue 3, pages 198–207, June 2009
How to Cite
Lacharme-Lora, L., Perkins, S. E., Humphrey, T. J., Hudson, P. J. and Salisbury, V. (2009), Use of bioluminescent bacterial biosensors to investigate the role of free-living helminths as reservoirs and vectors of Salmonella. Environmental Microbiology Reports, 1: 198–207. doi: 10.1111/j.1758-2229.2009.00031.x
- Issue published online: 18 MAY 2009
- Article first published online: 28 APR 2009
- Received 27 October, 2008; accepted 26 March, 2009.
Free-living microbivorous helminths that consume pathogenic bacteria could offer an environmental refuge for those pathogens and also, in the case of accidental ingestion, could transmit food-borne pathogens to humans and livestock. We tested this hypothesis by comparing the survival of Salmonella bacteria that had been ingested by the helminth Caenorhabditis elegans with that of the bacteria alone, in a series of experiments to mimic harsh environmental conditions. Using lux gene technology to record the in vivo growth of Salmonella we found that when inside C. elegans, the Salmonella exhibited enhanced survival at pH 2 and 3, in the presence of chlorine and when exposed to UV irradiation, thereby providing an environmental refuge or reservoir for the bacteria. On inoculating laboratory mice with C. elegans that had been fed on bioluminescent Salmonella, real-time imaging showed that animals developed a systemic bacterial infection, indicating that free-living helminths could play a role as a vector of pathogens.