| hepatitis b virus | species | viruses and viroids | viruses | species | 10407 |
| hiv-1 group o | no rank | viruses and viroids | viruses | no rank | 388799 |
| human t-lymphotropic virus 1 | no rank | viruses and viroids | viruses | no rank | 11908 |
| primate t-lymphotropic virus 1 | species | viruses and viroids | viruses | species | 194440 |
| simian foamy virus | species | viruses and viroids | viruses | species | 11642 |
| simian immunodeficiency virus | species | viruses and viroids | viruses | species | 11723 |
| simian t-cell lymphotropic virus 4 | no rank | | | no rank | 1454033 |
| simian t-lymphotropic virus 1 | no rank | viruses and viroids | viruses | no rank | 33747 |
| simian t-lymphotropic virus 3 | no rank | viruses and viroids | viruses | no rank | 39101 |