Fig. 8From: In vitro immune responses of porcine alveolar macrophages reflect host immune responses against porcine reproductive and respiratory syndrome virusesAntibody and Nab titres in PRRSV-infected pigs. a Weekly antibody titres in infected pigs were measured by performing a PRRSV ELISA. The 0.4 S/P ratio represents the designated threshold value and is indicated by a dashed line. b SVN antibody titres of sera collected from pigs infected with JA142c (n = 5) or VR2332c (n = 5) tested against JA142c at 21 and 28 dpc. c SVN antibody titres of sera collected from pigs infected with JA142c or VR2332c tested against VR2332c at 21 and 28 dpcBack to article page