TABLE 2.

Production of Brucella-specific serum antibody in mice inoculated orally with strain WR201 bacteria^a

WR201 dose(CFU)	Antibody level (OD ± SD)
	Anti-LPS		Anti-RFBL
	IgG	IgM	IgG	IgM
109	913 ± 2,008	31 ± 47	49 ± 102	1.2 ± 0.45
1010	3,069 ± 3,863	65 ± 78	47 ± 90	1 ± 0
1011	3,686 ± 2,959	87 ± 82	62 ± 87	1 ± 0

^aMice were inoculated with 10⁹, 10¹⁰, or 10¹¹ CFU of WR201, and blood was collected 4 weeks later for determination of serum anti-LPS or anti-RFBL antibody levels by ELISA. OD units represent the dilution of serum required to give an A₄₁₀ of 0.5.