Ferreira L das N, Finger PF, Castro CC de, et al. Effect of the ethanolic extract from green propolis on production of antibodies after immunization against canine parvovirus (CPV) and canine coronavirus (CCoV). Braz. J. Vet. Res. Anim. Sci. 2012;49(2):116-121. doi:10.11606/issn.2318-3659.v49i2p116-121