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Inactivation of Mycobacterium avium ssp. paratuberculosis in milk by UV treatment


Mycobacterium avium ssp. paratuberculosis (Map) is the known cause of Johne’s disease which affects both wild and domestic ruminants (Beard et al. 2001), particularly dairy cattle (Clarke 1997). The organism has also been implicated as a cause of Crohn’s disease in humans that manifests as a chronic enteritis which is incurable, although sufferers can experience periods of remission (Behr and Kapur 2008). Myco. avium ssp. paratuberculosis is excreted directly into the milk and faeces of infected animals in low and very high numbers respectively (Cocito et al. 1994). In the latter case even with good hygienic practices some faeces inevitably finds its way into milk. Milk and milk products must therefore be considered possible routes of exposure to the public from this organism.


Journal compilation ª 2009 The Society for Applied Microbiology, Letters in Applied Microbiology 49 (2009) 217–221 217