Viraemia estimated by qPCR for individual pigs post-inoculation and post-challenge. Viraemia estimated by qPCR and expressed as ASFV genome copy per ml of blood (y-axis) for individual pigs at different days post-inoculation and post-challenge (x-axis). Group 1 OUR T88/3 , Group 2 OUR T88/3ΔDP2 and Group 3 unvaccinated . Five pigs had no detectable ASFV DNA in blood post-immunisation (pig 1—Group 1, pigs 14, 15, 17 and 18—Group 2). Four pigs had no detectable levels of ASFV DNA in blood post-challenge (pigs 1 and 5—Group1, pigs 16 and 17—Group 2).