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Applied and Environmental Microbiology, May 2004, p. 2989-3004, Vol. 70, No. 5
0099-2240/04/$08.00+0     DOI: 10.1128/AEM.70.5.2989-3004.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Survival and Dormancy of Mycobacterium avium subsp. paratuberculosis in the Environment

Richard J. Whittington,1* D. Jeff Marshall,2 Paul J. Nicholls,3 Ian B. Marsh,3 and Leslie A. Reddacliff3

Faculty of Veterinary Science, The University of Sydney, Sydney,1 Orange Agricultural Institute, Orange,2 Elizabeth Macarthur Agricultural Institute, Camden, New South Wales, Australia3

Received 17 November 2003/ Accepted 3 February 2004

The survival of Mycobacterium avium subsp. paratuberculosis was studied by culture of fecal material sampled at intervals for up to 117 weeks from soil and grass in pasture plots and boxes. Survival for up to 55 weeks was observed in a dry fully shaded environment, with much shorter survival times in unshaded locations. Moisture and application of lime to soil did not affect survival. UV radiation was an unlikely factor, but infrared wavelengths leading to diurnal temperature flux may be the significant detrimental component that is correlated with lack of shade. The organism survived for up to 24 weeks on grass that germinated through infected fecal material applied to the soil surface in completely shaded boxes and for up to 9 weeks on grass in 70% shade. The observed patterns of recovery in three of four experiments and changes in viable counts were indicative of dormancy, a hitherto unreported property of this taxon. A dps-like genetic element and relA, which are involved in dormancy responses in other mycobacteria, are present in the M. avium subsp. paratuberculosis genome sequence, providing indirect evidence for the existence of physiological mechanisms enabling dormancy. However, survival of M. avium subsp. paratuberculosis in the environment is finite, consistent with its taxonomic description as an obligate parasite of animals.

* Corresponding author. Mailing address: Faculty of Veterinary Science, The University of Sydney, Private Bag 3, Camden, NSW 2570, Australia. Phone: 61 2 93511611. Fax: 61 2 93511618. E-mail: richardw{at}camden.usyd.edu.au.

Applied and Environmental Microbiology, May 2004, p. 2989-3004, Vol. 70, No. 5
0099-2240/04/$08.00+0     DOI: 10.1128/AEM.70.5.2989-3004.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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