A broad-spectrum vaccine against avian Reovirus is disclosed, which is effective in reducing the infection of avian Reovirus in an avian target. The vaccine comprises antigenic material derived from avian Reovirus of two genotype groups: 1 and 4, as defined herein. This vaccine is effective against all avian Reoviruses, homologous or heterologous to the vaccine, including recent virulent break-through strains.
