Safety and long-lasting immunity of the combined administration of a modified-live virus vaccine against porcine reproductive and respiratory syndrome virus 1 and an inactivated vaccine against porcine parvovirus and Erysipelothrix rhusiopathiae in breeding pigs

Table 2 Homologous viral neutralization test (VNT): neutralizing antibodies against the PRRSV MLV vaccine strain

		Day of the experiment
	Group	0	21	28	42	147	154
Proportion of positive pigs Homologous VNT (log₂ titer)^a Rank	V	0/6	6/6	6/6	6/6	6/6	6/6
			2.5 ± 0.5	3.8 ± 0.4^*	4.6 ± 1.2	3.9 ± 1.3	4.0 ± 0.4
			(2–3)	(3–4)	(3–6.6)	(2–6.0)	(3.6–4.6)
	C	0/4	0/4	0/4	0/4	0/4	0/4

Results are expressed as the mean ± standard deviation
^aNeutralization titres ≥1:4 (log₂ = 2) were considered to be of biological significance
^*Statistically significant differences between a given sample and the previous one (p < 0.05) (Friedman test)

ISSN: 2055-5660