- B19 virus
- Babanki virus
- baboon herpesvirus
- Baboon orthoreovirus
- Baboon polyomavirus 2
- Bacillus phage AP50
- Bacillus phage B103
- Bacillus phage Bam35
- Bacillus phage G
- Bacillus phage GA-1
- Bacillus phage PBS1
- Bacillus phage phi29
- Bacillus phage phiNS11
- Bacillus phage SPbeta
- Bacillus phage SPO1
- Bacterial virus
- Baculovirus
- Bagaza virus
- Bakau virus
- Bamboo mosaic virus
- Banana bract mosaic virus
- Banana bunchy top virus
- Banana mild mosaic virus
- Banana streak GF virus
- Banana streak MY virus
- Banana streak OL virus
- Banana streak VN virus
- Banna virus
- Banzi virus
- Barfin flounder nervous necrosis virus
- Barley mild mosaic virus
- Barley stripe mosaic virus
- Barley yellow dwarf virus
- Barley yellow dwarf virus-GPV
- Barley yellow dwarf virus-MAV
- Barley yellow dwarf virus-PAS
- Barley yellow dwarf virus-PAV
- Barley yellow dwarf virus-RMV
- Barley yellow dwarf virus-SGV
- Barley yellow mosaic virus
- Barley yellow striate mosaic virus
- Barmah Forest virus
- Basella rugose mosaic virus
- Bat adenovirus A
- Bat adenovirus B
- Batama virus
- Bayou virus
- Bdellovibrio phage MAC 1
- Bdellovibrio phage phiMH2K
- Beak and feather disease virus
- Bean calico mosaic virus
- Bean common mosaic necrosis virus
- Bean common mosaic virus
- Bean dwarf mosaic virus
- Bean golden mosaic virus
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- Bean golden yellow mosaic virus
- Bean leafroll virus
- Bean mild mosaic virus
- Bean pod mottle virus
- Bean rugose mosaic virus
- Bean yellow disorder virus
- Bean yellow dwarf virus
- Bean yellow mosaic virus
- Bear Canyon virus
- Bebaru virus
- Beet black scorch virus
- Beet chlorosis virus
- Beet curly top Iran virus
- Beet curly top virus
- Beet mild curly top virus
- Beet mild yellowing virus
- Beet mosaic virus
- Beet necrotic yellow vein virus
- Beet pseudoyellows virus
- Beet ringspot virus
- Beet severe curly top virus
- Beet soil-borne mosaic virus
- Beet soil-borne virus
- Beet virus Q
- Beet western yellows virus
- Beet yellow stunt virus
- Beet yellows virus
- Belladonna mottle virus
- Beluga whale coronavirus SW1
- Benevides virus
- Bermuda grass etched-line virus
- Berrimah virus
- Bertioga virus
- Betaretrovirus
- Bhendi yellow vein mosaic virus
- Bidens mottle virus
- Bimiti virus
- Birnavirus
- Bitter gourd yellow vein virus
- BK polyomavirus
- BK virus
- Black beetle virus
- Black Creek Canal virus
- Black queen cell virus
- Black raspberry necrosis virus
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- Blackberry chlorotic ringspot virus
- Blackberry virus S
- Blackberry virus Y
- Blackberry yellow vein-associated virus
- Blackcurrant reversion virus
- Blotched snakehead virus
- Blueberry leaf mottle virus
- Blueberry red ringspot virus
- Blueberry scorch virus
- Blueberry shock virus
- Blueberry shoestring virus
- Bluetongue virus
- Boerhavia yellow spot virus
- Bohle iridovirus
- Bolivian hemorrhagic fever virus
- Boma disease virus
- Bombyx mori bidensovirus
- Bombyx mori densovirus
- Bombyx mori latent virus
- Bombyx mori Mag virus
- Bombyx mori nucleopolyhedrovirus
- Bombyx mori Pao virus
- Boolarra virus
- Border disease of sheep virus
- Border disease virus
- Bordetella phage BPP-1
- Borgore Virus
- Borna disease virus
- Borna virus
- Botambi virus
- Botrytis virus F
- Botrytis virus X
- Bouboui virus
- Bougainvillea chlorotic vein banding virus
- Bovine adeno-associated virus
- Bovine adenovirus A
- Bovine adenovirus B
- Bovine adenovirus C
- Bovine adenovirus D
- Bovine alphaherpesvirus 1
- Bovine alphaherpesvirus 2
- Bovine coronavirus
- Bovine enterovirus
- Bovine ephemeral fever virus
- Bovine foamy virus
- Bovine herpesvirus 1
- Bovine herpesvirus 2
- Bovine herpesvirus 4
- Bovine herpesvirus 5
- Bovine herpesvirus 6
- Bovine immunodeficiency virus
- Bovine kobuvirus
- Bovine leukemia virus
- Bovine leukosis virus
- Bovine mammillitis virus
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- Bovine papillomavirus
- Bovine papular stomatitis virus
- Bovine parainfluenza virus 3
- Bovine parvovirus
- Bovine polyomavirus
- Bovine respiratory syncytial virus
- Bovine rhinitis A virus
- Bovine rhinitis B virus
- Bovine syncytial virus
- Bovine torovirus
- Bovine type C oncovirus
- Bovine viral diarrhea virus
- Bovine viral diarrhea virus 1
- Bovine viral diarrhea virus 2
- Bracovirus
- Brassica oleracea Melmoth virus
- Broad bean mottle virus
- Broad bean necrosis virus
- Broad bean stain virus
- Broad bean true mosaic virus
- Broad bean wilt virus 1
- Broad bean wilt virus 2
- Broccoli necrotic yellows virus
- Brome mosaic virus
- Brome streak mosaic virus
- Bromovirus
- Brugmansia mild mottle virus
- Brugmansia suaveolens mottle virus
- Bubaline herpesvirus 1
- Budgerigar fledgling disease polyomavirus
- Buggy Creek virus
- Bujaru virus
- Bukalasa bat virus
- Bulbul coronavirus HKU11
- Bundibugyo ebolavirus
- Bunyamwera virus
- Bunyavirus
- Burdock yellows virus
- Burkholderia phage Bcep1
- Burkholderia phage Bcep43
- Burkholderia phage Bcep781
- Burkholderia phage BcepC6B
- Burkholderia phage BcepF1
- Burkholderia phage BcepMu
- Burkholderia phage BcepNY3
- Burkholderia phage phi52237
- Burkholderia phage phiE12-2
- Burkholderia phage phiE202
- Burkholderia phage phiE255
- Burkitt's lymphoma virus
- Bushbush virus
- Butterfly flower mosaic virus
- Buzura suppressaria nucleopolyhedrovirus
- Bwamba Fever
- Bwamba virus
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