Variation in susceptibility of different breeds of sheep to Mycobacterium avium subspecies paratuberculosis following experimental inoculation

Table 2 Occurrence of infection in four breeds of sheep at necropsy (up to 14 months after MAP inoculation) as determined by culture from gut associated tissues

Breed	Total number of animals	Number of sheep with MAP infection	Occurrence (%)	Relative risk	(95% CI)	p value
Merino	36	25	69	1.00^a
White Suffolk × Merino	36	27	75	1.08	(0.81–1.44)	0.60
Border Leicester	34	18	53	0.76	(0.52–1.12)	0.17
Poll Dorset	36	17	47	0.68	(0.45–1.02)	0.06

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