User blog comment:Kogath/Monster Hunter 4 Ultimate for the Nintendo 3DS/@comment-21371438-20140415213756/@comment-5020152-20140416031811

Technically, any monster that can be infected can spread the virus.

But having another virus-based monster other than Gore/Shagaru would make the Feral Wyvern Virus seem a bit less unique. It would lose a lot of its appeal if more monsters utilized it.