Fig. 1From: 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 and HI titres of serum samples from all 180 gilts and sows depending on parity and applied vaccine. OD: optical density; red dotted line: OD-value of 0.3 representing the threshold of the applied ELISABack to article page