| Abbreviations | Meaning |
 | AHV | Abu Hammad Virus; Avian Herpes Virus |
| AHV | Atkinsonella Hypoxylon Virus |
| AICPV | Aporophyla Lutulenta Cypovirus |
| AIDNV | Aedes Albopictus Densovirus |
| AIHV | Alcelaphine Herpesvirus |
| AIMV | Alfalfa Mosaic Virus |
| AINOV | Aino Virus |
| AIV | AI Chi Virus |
| AKAV | Akabane Virus |
| AKRMLV | AKR Murine Leukemia Virus |
| AL-SV | Avian Leukosis Sarcoma Virus |
| ALCPV | Agrochola Lychnidis Cypovirus; Aporophyla Lutulenta Cypovirus |
| ALEV | Alenquer Virus |
| ALFV | Alfuy Virus |
| ALHV | Alcelaphine Herpesvirus |
| ALJV | Alajuela Virus |
| ALMV | Almeirim Virus; Almpiwar Virus; Anterior Leaflet Of The Mitral Valve |
| ALMV | Alfalfa Mosaic Virus |
| ALPV | Aphid Lethal Paralysis Virus |
| ALSTV | Alstroemeria Streak Virus |
| ALTV | Altamira Virus |
| ALV | Abelson Leukemia Virus |
| ALV | Adeno-like Virus |
| ALV | American Latent Virus |
| ALV | Arracacha Latent Virus |
| ALV | Avian Leukosis Virus |
| ALV-A | Avian Leukosis Virus A |
| ALV-HPRS103 | Avian Leukosis Virus-HPRS103 |
| AMAV | Amapari Virus |
| AMBV | Anhembi Virus |
| AMCPV | Antheraea Mylitta Cypovirus |
| AMCV | Avian Myelocytomatosis Virus |
| AMDV | Aleutian Mink Disease Virus |
| AMEV | Amsacta Moorei Entomopoxvirus |
| AMTV | Arumowot Virus |
| AMULV | Abelson Murine Leukemia Virus; Amphotrophic Murine Leukemia Virus |
| AMV | Alfalfa Mosaic Virus |
| AMV | Asteroid Mosaic Virus |
| AMV | Avian Myeloblastosis Virus |
| AMV-RT | Avian Myeloblastosis Virus Reverse Transcriptase |
| ANAV | Anopheles A Virus |
| ANBV | Anopheles B Virus |
| ANDV | Andasibe Virus; Andes Virus |
| ANFAMNPV | Anagrapha Falciform Multiple Nucleopolyhedrovirus |
| ANGHV | Anguillid Herpesvirus |
| ANHV | Anhanga Virus |
| ANHV | Anatid Herpesvirus |
| ANTLV | Anthriscus Latent Virus |
| ANTV | Antequera Virus |
| ANUV | Ananindeua Virus |
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