Presence of Mycobacterium avium subspecies paratuberculosis monitored over varying temporal and spatial scales in river catchments: persistent routes for human exposure

Richardson, Hollian; Rhodes, Glenn; Henrys, Peter; Sedda, Luigi; Weightman, Andrew J.; Pickup, Roger W.. 2019 Presence of Mycobacterium avium subspecies paratuberculosis monitored over varying temporal and spatial scales in river catchments: persistent routes for human exposure [in special issue: Non-tuberculous mycobacteria: emerging diseases and health impacts] Microorganisms, 7 (5), 136. 15, pp. https://doi.org/10.3390/microorganisms7050136

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Official URL: https://doi.org/10.3390/microorganisms7050136

Abstract/Summary

Mycobacterium avium subspecies paratuberculosis (Map) was monitored by quantitative PCR over a range of temporal and spatial scales in the River Tywi catchment. This study shows the persistence of Map over a 10-year period with little change, which correlates with the recognised levels of Johne’s disease in British herds over that period (aim 1). Map was quantified within the river at up to 108 cell equivalents L−1 and was shown to be consistently present when monitored over finer timescales (aim 4). Small wastewater treatment plants where the ingress of human-associated Map might be expected had no significant effect (aim 2). Map was found for the first time to be located in natural river foams providing another route for spread via aerosols (aim 5). This study provides evidence for the environmental continuum of Map from the grazing infected animal via rain driven runoff through field drains and streams into main rivers; with detection at a high frequency throughout the year. Should Map need to be monitored in the future, we recommend that weekly or monthly sampling from a fixed location on a river will capture an adequate representation of the flow dynamics of Map in a catchment (aim 3). The human exposure to Map during this process and its impact on human health remains unquantified.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.3390/microorganisms7050136
UKCEH and CEH Sections/Science Areas:	Water Resources (Science Area 2017-) Soils and Land Use (Science Area 2017-)
ISSN:	2076-2607
Additional Information. Not used in RCUK Gateway to Research.:	Open Access paper - full text available via Official URL link.
Additional Keywords:	Mycobacterium avium subspecies paratuberculosis, freshwater environment, Crohn’s disease, catchment
NORA Subject Terms:	Biology and Microbiology
Date made live:	29 May 2019 13:41 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/523500

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/10.3390/microorganisms7050136

UKCEH and CEH Sections/Science Areas:

Water Resources (Science Area 2017-)
Soils and Land Use (Science Area 2017-)

ISSN:

2076-2607

Additional Information. Not used in RCUK Gateway to Research.:

Open Access paper - full text available via Official URL link.

Additional Keywords:

Mycobacterium avium subspecies paratuberculosis, freshwater environment, Crohn’s disease, catchment