Virus-specific antibody titres in rabbits exposed to bovine viral diarrhoea virus (BVDV). A modified in-house antibody capture ELISA was used to measure antibodies against BVDV in plasma of rabbits from groups challenged: (a) intravenously (IV); (b) by nebuliser (N); and (c) through exposure to contaminated hay (H) (Figure 1). Samples for analysis were taken prior to exposure (d0) and at different time points after exposure (d3, 5, 8, 14, 22, 28). IV/N4 (dashed lines) were mock exposed rabbits. Neutralising antibody titres of terminal sera were determined by SNT (d28 SNT).