Table 2.

The neutralizing antibody titers of the remaining four serums against the six different PRRSV strains

Virus	Neutralizing antibody titers (Mean ± s.d.)
	N1	N2	N3	N5
rBB	38 ± 2	34 ± 4	42 ± 5	40 ± 3
rBB20s	16 ± 4	14 ± 2	16 ± 6	20 ± 4
rBB/GP2s	28 ± 2	30 ± 3	24 ± 5	32 ± 4
rBB20s/GP2	26 ± 4	18 ± 2	26 ± 3	24 ± 3
rBB/Ms	24 ± 2	16 ± 2	24 ± 3	20 ± 1
rBB20s/M	31 ± 3	28 ± 4	34 ± 6	36 ± 2

The data are represented as the means ± s.d. of three independent experiments