TABLE 3.

Effect of B. abortus RB51 at different days after oral vaccination^a

No. of days after vaccination	Animal no.	Stimulation index	CFU/ spleen	Spleen wt (mg)	Serological titer
7	1	2.6	0	98	NEGb
	2	1.8	0	99	NEG
	3	1.2	0	76	NEG
	4	1.2	0	87	NEG
	5	1.3	0	98	NEG
	Mean	1.6	0	92
15	1	1.1	0	97	NEG
	2	1.1	0	96	NEG
	3	1.2	25	109	NEG
	4	1.1	25	95	NEG
	5	1.1	0	113	NEG
	Mean	1.1	10	102
30	1	Not done	0	82	1:8
	2	1.3	975	135	NEG
	3	1.2	75	105	1:8
	4	1.1	25	66	NEG
	5	1.2	25	113	NEG
	Mean	1.2	220	122
42	1	1.6	0	96	NEG
	2	3.7	0	112	1:2
	3	3.0	0	127	1:8
	4	1.7	0	129	1:16
	5	5.6	0	120	NEG
	Mean	3.5	0	117

^aMice were orally vaccinated and killed at different times.

^bNEG, negative.