Family: Bornaviridae

Genus: Cultervirus


Distinguishing features

Culterviruses are currently known only from a fish through metagenomic sequencing (Shi et al., 2018, Costa et al., 2021).



Not reported.

Physicochemical and physical properties

Not reported.

Nucleic acid

The Wǔhàn sharpbelly bornavirus (WhSBV) genome consists of negative-sense non-segmented single-stranded RNA (about 8.99 kb).


Based on sequence comparisons, cultervirus genomes encode homologs of orthobornavirus proteins N, X, P, M, G, and L (see Table 1.Orthobornavirus in the Orthobornavirus genus section).


Not reported.


Not reported.

Genome organization and replication

The cultervirus genome organization resembles that of carboviruses by having the gene order 3′-N-X/P-G-M-L-5′ (Shi et al., 2018). The replication of culterviruses has not yet been described.


The presumed reservoir hosts of culterviruses are fish. WhSBV was sequenced from a specimen of a sharpbelly (Actinopterygii: Cyprinidae: Hemiculter leucisculus (Basilewsky, 1855)) in Wǔhàn, Húběi Province, China (Shi et al., 2018), whereas the sequence of Murray-Darling carp bornavirus (MDCBV) originates from a common carp (Actinopterygii: Cyprinidae: Cyprinus carpio [Linnaeus, 1758]) from the Murray-Darling basin, Australia (Costa et al., 2021).

Species demarcation criteria

The genus only includes a single species.