Effect of a DIVA vaccine with and without in-feed use of coated calcium-butyrate on transmission of SalmonellaTyphimurium in pigs

Table 2 Results of the descriptive and logistic regression analysis of the necropsy samples positive for the Salmonella challenge strain in the three groups

Group ^§	Parameters	Different necropsy samples						All necropsy samples
Group ^§	Parameters	Ileum	Ileal Content	Caecum	Caecal Content	Ileocaecal Lnn	Tonsils	All necropsy samples
A) DIVA vaccine (n = 16)	Number	4 ^a	4 ^ab	6 ^a	5 ^ab	3 ^a	4 ^a	26 ^ab
	(Proportion)	(25%)	(25%)	(38%)	(31%)	(19%)	(25%)	(27%)
	OR*	0.67	0.21	2.23	0.23	0.49	0.25	0.55
	P-value	0.66	0.10	0.38	0.07	0.41	0.18	0.05
B) DIVA vaccine + Coated Butyrate (n = 15)	Number	2 ^a	1 ^a	2 ^a	3 ^a	1 ^a	3 ^a	12 ^a
	(Proportion)	(13%)	(7%)	(13%)	(20%)	(7%)	(20%)	(13%)
	OR*	0.25	0.03	0.34	0.12	0.15	0.14	0.30
	P-value	0.18	0.01	0.33	0.02	0.10	0.08	<0.01
C) Positive control (n = 16) (ref)	Number	5 ^a	8 ^b	4 ^a	10 ^b	5 ^a	7 ^a	39 ^b
C) Positive control (n = 16) (ref)	(Proportion)	(31%)	(50%)	(25%)	(63%)	(31%)	(44%)	(41%)

^{a, b}Numbers in a column, not sharing the same letters in superscript, are significantly different: ileal and caecal content (P < 0.02) and all necropsy samples (P < 0.01).
*Odds Ratios (OR) >1 or <1, define the intervention of group A or B as a risk or protective factor, respectively, for having Salmonella-positive tissue samples, when compared to the positive control group.
^§A) oral vaccination at four and seven weeks of age with 10⁷ - 10⁸ CFU/2 mL of the live ‘Salmoporc-∆rfaJ’ strain; B) vaccination of (A) plus feed supplemented with 0.3% coated calcium-butyrate salt; C) positive control that was challenged without being treated.

ISSN: 1746-6148