Genus: Twortvirus

Genus: Twortvirus

Distinguishing features

Members of this genus infect Staphylococcus sp. The type species is Staphylococcus virus Twort. The genome of the exemplar isolate of the type species is 130 kbp, with a total of 195 gene coding sequences and no tRNAs. 


See discussion under family description.

Genome organisation and replication 

See discussion under family description.


Members of the genus infect Staphylococcus sp.

Derivation of names

Twortvirus: derived from the name of the exemplar isolate, Staphylococcus phage Twort, of the type species, itself named after Frederick William Twort (1877–1950), the English bacteriologist who discovered prokaryotic viruses in 1915.

Species demarcation criteria

Members of the same species are more than 95% identical in genome nucleotide sequence, including the terminal repeat region. Phages with genomes that differ by more than 5% are assigned to different species.

Member species

Exemplar isolate of the species
SpeciesVirus nameIsolateAccession numberRefSeq numberAvailable sequenceVirus Abbrev.
Twortvirus twortStaphylococcus phage TwortAY954970NC_007021Complete genome

Virus names, the choice of exemplar isolates, and virus abbreviations, are not official ICTV designations.