Rabies and rabies-related viruses are divided into four serotypes, alt
hough it has been suggested that the inclusion of European bat lyssavi
ruses results in six genotypes. Sixty-four rabies-related viruses were
tested against a panel of 36 anti-nucleocapsid monoclonal antibodies
prepared from the immunization of Balb/c mice with five prototypic rab
ies-related viruses. Reaction patterns obtained confirmed the original
distinction between serotype 1-4 viruses and revealed multiple varian
ts of Lagos bat and Mokola viruses. In addition, two biotypes of Europ
ean bat lyssavirus were identified and a clear distinction was shown b
etween these biotypes and Duvenhage virus of Africa. The origins and i
mportance of the rabies-related viruses are discussed.