has function has role immunizes recipient immunizes against pathogen Canine parvovirus Canis lupus USDA licensed vaccine role preventive vaccine function prophylactic vaccine live attenuated viral vaccine gray wolf vaccine Parvovirus Modified Live Virus Vaccine (USDA: 18M1.23) VIOLIN: https://violinet.org/vaxquery/vaccine_detail.php?c_vaccine_id=2082 vaccine 2082 USDA: 18M1.23 Asiyah Yu Lin USA licensed veterinary vaccine live attenuated vaccine role canine parvovirus vaccine