Versican Plus DHPPi/L4 (canine distemper, adenovirus, parvovirus & parainfluenza virus) is a vaccine used to protect dogs against canine distemper, adenovirus (hepatitis and respiratory disease), parvovirus, parainfluenza, and leptospirosis. Contains live, attenuated (weakened) strains of canine distemper virus, canine adenovirus types 1 and 2, canine parvovirus, and canine parainfluenza virus, and inactivated strains of Leptospira bacteria.