| alkhumra hemorrhagic fever virus | no rank | viruses and viroids | viruses | no rank | 172148 |
| alongshan virus | species | | | species | 2269360 |
| apoi virus | species | viruses and viroids | viruses | species | 64280 |
| aroa virus | species | viruses and viroids | viruses | species | 64303 |
| bagaza virus | species | viruses and viroids | viruses | species | 64290 |
| banzi virus | species | viruses and viroids | viruses | species | 38837 |
| bouboui virus | species | viruses and viroids | viruses | species | 64295 |
| bovine viral diarrhea virus 1 | species | viruses and viroids | viruses | species | 11099 |
| bovine viral diarrhea virus 2 | no rank | viruses and viroids | viruses | no rank | 54315 |
| bussuquara virus | no rank | viruses and viroids | viruses | no rank | 64304 |