Two closely related viruses were isolated from the blood of bovines ne
ar Darwin, Northern Territory, Australia. When studies of virus morpho
logy indicated that these were rhabdoviruses, serologic studies were d
one. These isolates are closely related or identical and are related t
o, but distinct from, the rabies-related kotonkan virus. Other serolog
ic studies showed that these are two isolates of a newly recognized vi
rus, for which the name Koolpinyah virus is proposed.