TABLE 1.

Incidence of Salmonella infection following intranasal challenges of pigs with various levels of Salmonella serovar Typhimurium

Sample type	No. of positive tissue samples
	Trial 1 (n = 5)			Trial 2 (n = 5)			Negative controls (n = 6)
	101a	103	105	103	105	107
Alimentary
Tonsil	0	0	3	1	3	5	0
Ileum	0	0	2	0	3	5	0
Cecum contents	0	0	2	0	2	5	0
Colon contents	0	0	0	0	0	5	0
% Positive	0	0	35	5	40	100	0
Nonalimentary							0
Mandibular lymph node	0	0	1	0	1	1	0
Thymus	0	0	0	0	0	1	0
Lung	0	0	0	0	0	0	0
Liver	0	0	0	0	0	0	0
Spleen	0	0	0	0	0	0	0
Ileocecal lymph node	0	0	0	0	0	0	0
Muscle	0	0	0	0	0	0	0
Blood	0	0	0	0	0	0	0
% Positive	0	0	3	0	3	5	0
% Positive (all tissues)	0	0	13	2	15	37	0

^aIntranasal challenge dose of salmonellae.