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Members of this subfamily infect Bacillus sp. including B. cereus and B. subtilis. Virus genomes are of 132–146 kbp and have long terminal repeats.
Spounavirinae – derived from Bacillus phage SPO1 (i.e. spo and una, meaning one), the first recognised isolate of this subfamily.
The Spounavirinae genera are well-supported monophyletic clades in genome-based phylogenies and in (concatenated) marker gene phylogenies. Members of the genera share at least 60% nucleotide identity across the genome length. The genome organisation is conserved. Members of the same genus generally infect members of the same bacterial genus.
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