Nyamiviridae is a family of negative-strand RNA viruses in the order Mononegavirales.

NYMV has been isolated from cattle egrets (species Bubulcus ibis) and ticks (species Argas walkerae) in Egypt, India, Nigeria, South Africa, and Thailand.

MDWV has been isolated from ticks of the genus Ornithodoros collected in Midway, Kure and Manana islands and northern Honshu, Japan.

Nyamiviral genomes are linear, nonsegmented and bisegmented, and around 11.6 kbp in total length.

[2][5] Of these, only two have been assigned a function: the putative nucleocapsid protein and RNA-dependent RNA polymerase.