TABLE 2.

Average numbers of tissues positive by culture and histopathology among tissues obtained from calves at necropsy 12 months following oral or intraperitoneal challenge with live Mycobacterium avium subsp. paratuberculosis^a

Tissued	% Positive tissues for treatment group (unless stated otherwise)
	Oral	i.p.	Oral/DXM	Oral/M
Jejunum + LN (proximal, mid-, and distal)b	54	25	42	67
Ileum + LN (proximal, mid-, and distal)c	17	25	17	50
Duodenum + LN	50	50	38	50
Ileocecal valve	50	100	50	67
Ileocecal LN	25	50	0	33
Spleen	50	100	50	33
Iliac LN	75	50	50	33
Spiral colon + LN	63	25	38	50
Transcending colon + LN	13	13	25	50
Descending colon + LN	25	0	13	17
Avg no. of positive tissue sites	10.3	8.5	9.5	15
Avg no. of tissues with lesions	19	8	31	15

^aThe total number of tissue sites sampled per calf was 22.

^bThree sections of the jejunum (proximal, mid-, and distal sections) plus three associated lymph nodes (n = 6) were sampled.

^cThree sections of the ileum (proximal, mid-, and distal sections) plus one associated lymph node (n = 4) were sampled.

^dTissue + LN, the lymph node (LN) associated with that tissue site was also collected (n = 2 tissue sites).