Evidence of land‐sea transfer of the zoonotic pathogen Campylobacter to a wildlife marine sentinel species |
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| Authors: | Johanna L. Baily Guillaume Méric Sion Bayliss Geoffrey Foster Simon E. Moss Eleanor Watson Ben Pascoe Jane Mikhail Romain Pizzi Robert J. Goldstone David G. E. Smith Kim Willoughby Ailsa J. Hall Mark P. Dagleish |
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| Affiliation: | 1. Moredun Research Institute, Penicuik, UK;2. SeaMammal Research Unit, University of St Andrews, Fife, UK;3. College of Medicine, Institute of Life Science, Swansea University, Swansea, UK;4. Scottish Rural College, Inverness, UK;5. MRC CLIMB Consortium, Institute of Life Science, Swansea University, Swansea, UK;6. Royal Zoological Society of Scotland, Edinburgh, UK;7. Scottish SPCA National Wildlife Rescue Centre, Fishcross, UK;8. Institute of Infection, Immunity and Inflammation, University of Glasgow, Glasgow, UK |
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| Abstract: | Environmental pollution often accompanies the expansion and urbanization of human populations where sewage and wastewaters commonly have an impact on the marine environments. Here, we explored the potential for faecal bacterial pathogens, of anthropic origin, to spread to marine wildlife in coastal areas. The common zoonotic bacterium Campylobacter was isolated from grey seals (Halichoerus grypus), an important sentinel species for environmental pollution, and compared to isolates from wild birds, agricultural sources and clinical samples to characterize possible transmission routes. Campylobacter jejuni was present in half of all grey seal pups sampled (24/50 dead and 46/90 live pups) in the breeding colony on the Isle of May (Scotland), where it was frequently associated with histological evidence of disease. Returning yearling animals (19/19) were negative for C. jejuni suggesting clearance of infection while away from the localized colony infection source. The genomes of 90 isolates from seals were sequenced and characterized using a whole‐genome multilocus sequence typing (MLST) approach and compared to 192 published genomes from multiple sources using population genetic approaches and a probabilistic genetic attribution model to infer the source of infection from MLST data. The strong genotype‐host association has enabled the application of source attribution models in epidemiological studies of human campylobacteriosis, and here assignment analyses consistently grouped seal isolates with those from human clinical samples. These findings are consistent with either a common infection source or direct transmission of human campylobacter to grey seals, raising concerns about the spread of human pathogens to wildlife marine sentinel species in coastal areas. |
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| Keywords: |
Campylobacter
environmental health genomics grey seals source attribution |
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