Long-term survival of Escherichia coli O157 on pasture following an outbreak associated with sheep at a scout camp
Version of Record online: 21 JAN 2002
Letters in Applied Microbiology
Volume 34, Issue 2, pages 100–104, February 2002
How to Cite
Ogden, I.D. , Hepburn, N.F. , MacRae, M. , Strachan, N.J.C. , Fenlon, D.R. , Rusbridge, S.M. and Pennington, T.H. (2002), Long-term survival of Escherichia coli O157 on pasture following an outbreak associated with sheep at a scout camp. Letters in Applied Microbiology, 34: 100–104. doi: 10.1046/j.1472-765x.2002.01052.x
- Issue online: 21 JAN 2002
- Version of Record online: 21 JAN 2002
Aims: To monitor the decay of E. coli O157 in soil (loamy sand) on a scout campsite following an outbreak in humans.
Methods and Results: Samples of soil and sheep faeces were collected from the campsite and tested for the presence of E. coli O157 by immunomagnetic separation (IMS) after enrichment in buffered peptone water + vancomycin at 42°C for 6 h. Enumeration of target was carried out by direct plating onto sorbitol MacConkey agar plates supplemented with cefixime and tellurite (CTSMAC) incubated at 37°C for 24 h. Low numbers (< 100 g−1) were estimated by the most probable number (3-tube MPN) technique.
Conclusions: Survival was observed for 15 weeks.
Significance and Impact of the Study: A number of laboratory studies have followed the decay of E. coli O157 in soil, animal faeces and water. This study follows (for the first time) the decay of the organism in soil after an outbreak associated with sheep. It demonstrates the long-term persistence of the organism in the environment and the results will be potentially important in performing risk assessments for both human and animal infection.