Table 1. Viral genomic statistics based upon different classification systems.
Only median values are reported in this table. Genome length data is rounded to the nearest kilobase. N corresponds to the number of viruses from which data is obtained.
| Classification | N | Genome length (kb) | Percent noncoding (DNA/RNA) | Median gene length (bases) | |
|---|---|---|---|---|---|
| Host Domain | Eukaryotic Viruses | 1384 | 8 | 10 | 1055 |
| Bacteria Viruses | 969 | 43 | 9 | 408 | |
| Archaea Viruses | 46 | 24 | 10 | 400 | |
| Baltimore | Group I (dsDNA) | 1211 | 44 | 9 | 429 |
| Group II (ssDNA) | 431 | 3 | 14 | 588 | |
| Group III (dsRNA) | 123 | 8 | 8 | 2291 | |
| Group IV (+ssRNA) | 482 | 9 | 5 | 2366 | |
| Group V (-ssRNA) | 101 | 12 | 7 | 1353 | |
| Group VI (ssRNA-RT) | 14 | 8 | 16 | 1799 | |
| Group VII (dsDNA-RT) | 37 | 8 | 11 | 558 | |
| Nucleotide Type | DNA Viruses | 1679 | 38 | 10 | 444 |
| RNA Viruses | 720 | 9 | 6 | 2072 | |
| ICTV (orders) | Caudovirales | 879 | 44 | 9 | 408 |
| Herpesvirales | 55 | 159 | 19 | 1107 | |
| Ligamenvirales | 11 | 37 | 12 | 372 | |
| Mononegavirales | 71 | 12 | 8 | 1266 | |
| Nidovirales | 35 | 27 | 3 | 672 | |
| Picornavirales | 89 | 8 | 11 | 7056 | |
| Tymovirales | 73 | 8 | 4 | 693 | |
| Combinations of different classifications | All Eukaryotic dsDNA viruses | 271 | 33 | 11 | 990 |
| All Bacterial dsDNA viruses | 899 | 44 | 9 | 408 | |
| All Archaeal dsDNA viruses | 41 | 28 | 10 | 396 | |
| All Eukaryotic ssDNA viruses | 375 | 3 | 14 | 732 | |
| All Bacterial ssDNA viruses | 51 | 7 | 14 | 348 | |