Table 2.

SOD activity of cultured splenocytes' macrophages at different intervals post SPPV immunization

Time post treatment	Treatment
	Placebo	Inac.SPPV	Atenu. SPPV
12 h	13.3 ± 1.65	13.6 ± 1.22	12.8 ± 1.35
3 d	12.5 ± 2.8	10.82 ± 2.21	133 ± 23.1**
6 d	10.2 ± 1.79	107.7 ± 25 *	143.7 ± 38*
9 d	52.3 ± 19.1	253.3 ± 33.4**	240.7 ± 42.4 **
12 d	47.6 ± 8.5	266 ± 26.6**	293 ± 37.1**

Splenic macrophages were harvested from mice (five/group). Macrophages were cultured with LPS (1 μg/ml) for 48 h and SOD was measured in the culture supernatant. SPPV treated mice are significantly different from controls at *P < 0.05 or **P < 0.01.