CANINE PARVOVIRUS VACCINES COMPRISING VIRUSES OF THE CANINE PARVOVIRUS STRAIN 154 OR VIRUSES DERIVED THEREFROM BY ADDITIONAL CELL CULTURE PASSAGING

摘要

The present invention concerns a vaccine comprising a novel canine parvovirus strain and having the property of being able to break through the maternally derived antibody levels persistent in 9-12 week old pups, and even to immunize the majority of pups at the age of 6 weeks in the presence of maternally derived antibodies.