Fig. 2From: Duration of maternally derived antibodies of porcine parvovirus in growing pigs and presence of antibodies in gilts and sows vaccinated with three different parvovirus vaccinesOD values of serum samples from all 270 growing pigs depending on the age and farm and vaccine applied to the mother sows. OD: optical density; red dotted line: OD-value of 0.3 representing the threshold of the applied ELISABack to article page