| 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 |