- B -
- B virus
- B19 virus
- bacterial virus
- Barmah Forest virus
- Bayou virus
- Bittner virus
- biundulant milk fever virus
- BK virus
- Black Creek Canal virus
- bluecomb virus
- bluetongue virus
- Bolivian hemorrhagic fever virus
- Borna disease virus
- Bornholm disease virus
- bovine leukemia virus
- bovine leukemia virus (BLV)
- bovine papular stomatitis virus
- bovine virus diarrhea virus
- breakpoint cluster region-Abelson murine leukemia virus (BCR-ABL)
- Brunhilde virus
- Bunyamwera virus
- Bwamba fever virus
- Bwamba virus
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