TABLE 5.

Antibody responses to S. choleraesuis as measured by ELISA^a

Strain or group	ELISA absorbance at 655 nm for sera collected at:
	Day 1 (prevaccination)	Day 25 (prechallenge)	Day 52/53 (necropsy)
Nonvaccinated, challenged	0.094 ± 0.013*	0.149 ± 0.039*	0.770 ± 0.133**
Nonvaccinated, nonchallenged	0.128 ± 0.019*	0.305 ± 0.218*	0.340 ± 0.240*
NOBL SC-54	0.137 ± 0.030*	0.294 ± 0.159*	0.521 ± 0.215**
χ3781	0.144 ± 0.006*	0.349 ± 0.105**	0.452 ± 0.094***
χ3923	0.103 ± 0.013*	0.228 ± 0.084**	0.549 ± 0.189***
χ4186	0.097 ± 0.014*	0.328 ± 0.151**	0.489 ± 0.239**
χ4497	0.102 ± 0.033*	0.253 ± 0.103**	0.657 ± 0.253***
χ4522	0.085 ± 0.002*	0.217 ± 0.111**	0.623 ± 0.159***
χ4814	0.126 ± 0.023*	0.227 ± 0.094*	0.696 ± 0.220**
Positive control (59-9)	ND	1.114	1.113
Negative control sera	0.106	0.134	0.130

^aND, not determined. * to ***, values with different superscripts within rows differed significantly (P < 0.05).