Observations on the use of an inactivated canine parvovirus vaccine.

Data are presented on studies of field and experimental use of a formalin-inactivated canine parvovirus vaccine. There was an absolute correlation between a single successful vaccination and subsequent protection against clinical disease. Unsuccessful vaccinations were consistently associated with the presence of maternal antibody at the time of vaccination. The vaccine induced an antibody response within two days and anamnestic responses within 24 hours. It is suggested that a single successful vaccination probably protects against clinical parvovirus disease for life.