The ability of a modified live canine parvovirus type 2b vaccine to elicit active immunization in pups with maternally derived antibodies (MDA) by intranasal administration was evaluated. The vaccine induced seroconversion in 100% of pups with MDA titers of < or = 80 and in 51.6% of pups with titers between 160 and 320.
Department of Animal Health and Well-Being, Faculty of Veterinary Medicine, University of Bari, S.p. per Casamassima km 3, 70010 Valenzano, Bari, Italy. v.martella@veterinaria.uniba.it