Resuscitation of MAP and Growth Stimulation
Dormancy, a physiological state in which MAP is viable but non-culturable, can occur during adverse environmental conditions (Whittington et al., 2004). Lamont et al. (2012) reported that 1-year-old broth cultures of MAP contained a mix of vegetative cells and a morphotype resembling a spore.
Conceptually it may be possible to improve culture success rates by stimulating dormant cells to resume vegetative growth. Recently, Rock et al. (2016) reported significant improvement in growth and recovery rate of presumed dormant MAP when a commercial reducing agent Oxyrase® was incorporated in M7H9C liquid medium, but there does not appear to have been any further work published. Claims have also been made about the substantial benefits of a non-disclosed commercial growth stimulant for cultivation of MAP (Bull et al., 2016), but without proper validation data or follow-up studies it is not possible to assess these claims.18.8
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