Figure 3From: Pathogenesis and antigenic characterization of a new East European subtype 3 porcine reproductive and respiratory syndrome virus isolateThe cross-reaction of antisera with homologous and heterologous IPMA antigens. Symbols represent mean titres, whiskers above and below are standard deviations. Titres lower than 1.7 log4 were considered to be negative. *The difference is significant between homologous and heterologous antibody titres.Back to article page