Use of growth indices from radiometric culture for quantification of sheep strains of Mycobacterium avium subsp. paratuberculosis.

A simple method for using growth indices from radiometric BACTEC cultures was evaluated for the enumeration of Australian sheep strains of Mycobacterium avium subsp. paratuberculosis. The numbers of viable organisms in inocula were determined by end-point titration in BACTEC cultures.