Provided is a method for preventing infections using a combination of a vector vaccine and a live vaccine. A recombinant vector virus (a vector vaccine) which is produced by integrating a DNA fragment encoding an infection-protective antigen derived from an animal infectious factor of a virus, a bacterium or the like into a virus genome by a gene recombination technique an attenuated infectious factor (a live vaccine) which is produced by attenuating the infectious factor a method for preventing infections in a non-human animal, which is characterized by using the vector vaccine and the live vaccine in combination and a vaccine which is characterized by being produced using the vector vaccine and the live vaccine as active ingredients.
