TABLE 1.

UV inactivation rates for declumped M. avium subsp. paratuberculosis cells suspended in different substrates as determined by the FASTPlaqueTB phage assay and culture on HEYM^a

M. avium subsp. paratuberculosis strain	Enumeration method	Mean log10 reduction per 1,000-mJ/ml UV dose for indicated test substrate
		Middlebrook 7H9 broth	Semiskim milk	Whole milk
806R	Phage assay	2.56	0.59	0.62
	Culture	2.70	0.82	0.93
796PSS	Phage assay	2.64	0.72	0.52
	Culture	3.07	0.74	0.91
NCTC 8578	Phage assay	3.26	0.75	0.52
	Culture	2.92	1.01	0.87

^aResults are means for two independent runs.