| Abbreviations | Meaning |
 | ATV | Abelson Virus Transformed |
 | ATV | Avian Tumor Virus |
 | ATV | Abelson Virus Transformed; Ambystoma Tigrinum Stebbinsi Virus; Antisense Target Validation; Atazanavir; Avian Tumor Virus |
 | AUCPV | Aglais Urticae Cypovirus |
 | AURAV | Aura Virus |
 | AV | Arenavirus |
 | AV | Adeno-associated Virus; Adenovirus; Adriamycin And Vincristine; Air Velocity; Allergic Vasculitis; Anteroventral; Anteversion; Anticipatory Vomiting |
 | AV | Ascovirus |
 | AV | Asparagus Virus |
 | AVA | Arracacha Virus A |
 | AVACPV | Agraulis Vanillae Cypovirus |
 | AVAV | Avalon Virus |
 | AVB | Arracacha Virus B; Atrioventricular Block |
 | AVDNV | Agraulis Vanillae Densovirus |
 | AVICPV | Arctia Villica Cypovirus |
 | AVREO | Avian Reovirus |
 | AVV | Agraulis Vanillae Virus |
 | AVY | Arracacha Virus Y |
 | AWBV | Ahlum Waterborne Virus |
 | AXCPV | Anti-xanthomista Cypovirus |
 | AYV | Anthriscus Yellows Virus |
 | AZEV | Acrobasis Zelleri Entomopoxvirus |
 | B19-PRCA | Pure Red Cell Aplasia Caused By Parvovirus B19 |
 | BAAV | Bovine Adeno-associated Virus |
 | BABV | Babahoya Virus |
 | BADV | Bovine Adenovirus |
 | BADV-A, B, C | Bovine Adenovirus A, B And C |
 | BAEV | Baboon Endogenous Virus |
 | BAGV | Bagaza Virus |
 | BAHV | Bahig Virus |
 | BAKUV | Baku Virus |
 | BAKV | Bakel Virus; Bakau Virus |
 | BAMMV | Barley Mild Mosaic Virus |
 | BAMV | Bamboo Mosaic Virus |
 | BANV | Banzi Virus |
 | BAPV | Bovine Alimentary Papilloma Virus |
 | BAPV | Bovine Alimentary Papillomavirus |
 | BARV | Barur Virus |
 | BARV | Barley Virus |
 | BARV-B1 | Barley Virus B1 |
 | BASTV | Bovine Astrovirus |
 | BASV | Bajra Streak Virus |
 | BATV | Batai Virus |
 | BAUV | Bauline Virus |
 | BAV | Banana Virus; Bicuspid Aortic Valve; Bivens Arm Virus |
 | BAV | Barramundi Virus |
 | BAV-CH | Banana Virus-China |
 | BAYMV | Barley Yellow Mosaic Virus |
 | BAYV | Bayou Virus |
 | BBCPV | Biston Betularia Cypovirus |