Fig. 3From: Investigation of chronic and persistent classical swine fever infections under field conditions and their impact on vaccine efficacyNeutralizing antibody response in piglets. Neutralizing antibody titres were detected by NPLA at 21 dpv (grey bars) and 96 dpv (white bars). Only the litters in which neutralizing antibody titres were detected are shown. * indicates animals that died before 21 dpv. † indicates animals that died between 21 and 96 dpvBack to article page