| baboon t-cell leukemia virus | Yes | no rank | viruses and viroids | viruses | no rank | 47688 | click here |
| bacillus albus | Yes | species | | | species | 2026189 | click here |
| bacillus anthracis | Yes | species | bacteria | bacteria | species | 1392 | click here |
| bacillus atrophaeus | Yes | species | bacteria | bacteria | species | 1452 | click here |
| bacillus cereus | Yes | species | bacteria | bacteria | species | 1396 | click here |
| bacillus oleronius | Yes | species | bacteria | bacteria | species | 38875 | click here |
| bacillus paralicheniformis | Yes | species | | | species | 1648923 | click here |
| bacillus pumilus | Yes | species | bacteria | bacteria | species | 1408 | click here |
| bacillus safensis | Yes | species | bacteria | bacteria | species | 561879 | click here |
| bacillus sp. n-11 | Yes | no rank | bacteria | bacteria | species | 996558 | click here |
| bacillus velezensis | Yes | species | bacteria | bacteria | species | 492670 | click here |
| bacteroides cellulosilyticus | Yes | species | bacteria | bacteria | species | 246787 | click here |
| bakau orthobunyavirus | Yes | species | viruses and viroids | viruses | species | 1933175 | click here |
| balamuthia mandrillaris | Yes | species | eukaryota | invertebrates | species | 66527 | click here |
| bartonella henselae | Yes | species | bacteria | bacteria | species | 38323 | click here |
| bartonella quintana | Yes | species | bacteria | bacteria | species | 803 | click here |
| bartonella quintana bq2-d70 | Yes | no rank | | | no rank | 1402978 | click here |
| bartonella quintana rm-11 | Yes | no rank | | | no rank | 1225179 | click here |
| batai virus | Yes | no rank | viruses and viroids | viruses | no rank | 80942 | click here |
| baylisascaris procyonis | Yes | species | eukaryota | invertebrates | species | 6259 | click here |
| baylisascaris transfuga | Yes | species | eukaryota | invertebrates | species | 6260 | click here |
| bertiella studeri | Yes | species | eukaryota | invertebrates | species | 578852 | click here |
| bifidobacterium angulatum | Yes | species | bacteria | bacteria | species | 1683 | click here |
| bifidobacterium animalis subsp. lactis | Yes | subspecies | bacteria | bacteria | subspecies | 302911 | click here |
| bifidobacterium dentium | Yes | species | bacteria | bacteria | species | 1689 | click here |
| bifidobacterium pseudocatenulatum | Yes | species | bacteria | bacteria | species | 28026 | click here |
| bifidobacterium pseudolongum subsp. globosum | Yes | subspecies | bacteria | bacteria | subspecies | 1690 | click here |
| bifidobacterium sp. | Yes | no rank | bacteria | bacteria | species | 41200 | click here |
| bifidobacterium sp. dsm 109960 | Yes | no rank | | | species | 2705432 | click here |
| blastocystis hominis | Yes | species | eukaryota | plants | species | 12968 | click here |
| blastocystis sp. | Yes | species | eukaryota | plants | species | 46767 | click here |
| blastocystis sp. mj99-116 | Yes | no rank | eukaryota | plants | species | 227993 | click here |
| blastocystis sp. mj99-568 | Yes | no rank | eukaryota | plants | species | 227992 | click here |
| blastocystis sp. subtype 1 | Yes | no rank | eukaryota | plants | species | 944036 | click here |
| blastocystis sp. subtype 1 strain vervet13 | Yes | no rank | eukaryota | plants | no rank | 926710 | click here |
| blastocystis sp. subtype 1 strain vervet14 | Yes | no rank | eukaryota | plants | no rank | 926711 | click here |
| blastocystis sp. subtype 1 strain vervet17 | Yes | no rank | eukaryota | plants | no rank | 926712 | click here |
| blastocystis sp. subtype 10 | Yes | no rank | eukaryota | plants | species | 944207 | click here |
| blastocystis sp. subtype 19 | Yes | no rank | | | species | 1544338 | click here |
| blastocystis sp. subtype 2 | Yes | no rank | eukaryota | plants | species | 944160 | click here |
| blastocystis sp. subtype 2 strain vervet12 | Yes | no rank | eukaryota | plants | no rank | 926714 | click here |
| blastocystis sp. subtype 2 strain vervet15 | Yes | no rank | eukaryota | plants | no rank | 926715 | click here |
| blastocystis sp. subtype 3 | Yes | no rank | eukaryota | plants | species | 944168 | click here |
| blastocystis sp. subtype 3 strain vervet1 | Yes | no rank | eukaryota | plants | no rank | 926717 | click here |
| bocaparvovirus sp. | Yes | species | | | species | 1883111 | click here |
| bordetella bronchiseptica | Yes | species | bacteria | bacteria | species | 518 | click here |
| borna disease virus | Yes | species | viruses and viroids | viruses | species | 12455 | click here |
| borrelia recurrentis | Yes | species | bacteria | bacteria | species | 44449 | click here |
| bouboui virus | Yes | species | viruses and viroids | viruses | species | 64295 | click here |
| bovine parainfluenza virus 3 | Yes | species | viruses and viroids | viruses | species | 11215 | click here |
| brucella papionis | Yes | species | | | species | 1462582 | click here |
| brugia malayi | Yes | species | eukaryota | invertebrates | species | 6279 | click here |
| brugia pahangi | Yes | species | eukaryota | invertebrates | species | 6280 | click here |
| brugia timori | Yes | species | eukaryota | invertebrates | species | 42155 | click here |
| bundibugyo ebolavirus | Yes | species | viruses and viroids | viruses | species | 565995 | click here |
| bunyamwera orthobunyavirus | Yes | species | | | species | 1933179 | click here |
| bunyamwera virus | Yes | species | viruses and viroids | viruses | species | 35304 | click here |
| burkholderia pseudomallei | Yes | species | bacteria | bacteria | species | 28450 | click here |
| butyrate-producing bacterium l2-7 | Yes | no rank | bacteria | bacteria | species | 105843 | click here |
| buxtonella-like sp. bc1 | Yes | no rank | | | species | 1144356 | click here |
| buxtonella-like sp. bc110 | Yes | no rank | | | species | 1144357 | click here |
| buxtonella-like sp. bc111 | Yes | no rank | | | species | 1144358 | click here |
| buxtonella-like sp. bc112 | Yes | no rank | | | species | 1144359 | click here |
| buxtonella-like sp. bc116 | Yes | no rank | | | species | 1144360 | click here |
| buxtonella-like sp. bc118 | Yes | no rank | | | species | 1144361 | click here |
| buxtonella-like sp. bc13 | Yes | no rank | | | species | 1144362 | click here |
| buxtonella-like sp. bc132 | Yes | no rank | | | species | 1144363 | click here |
| buxtonella-like sp. bc160 | Yes | no rank | | | species | 1144364 | click here |
| buxtonella-like sp. bc162 | Yes | no rank | | | species | 1144365 | click here |
| buxtonella-like sp. bc176 | Yes | no rank | | | species | 1144366 | click here |
| buxtonella-like sp. bc184 | Yes | no rank | | | species | 1144367 | click here |
| buxtonella-like sp. bc197 | Yes | no rank | | | species | 1144368 | click here |
| buxtonella-like sp. bc2 | Yes | no rank | | | species | 1144369 | click here |
| buxtonella-like sp. bc4 | Yes | no rank | | | species | 1144370 | click here |
| buxtonella-like sp. bc5 | Yes | no rank | | | species | 1144371 | click here |
| buxtonella-like sp. bc95 | Yes | no rank | | | species | 1144372 | click here |
| bwamba virus | Yes | species | viruses and viroids | viruses | species | 35310 | click here |
| caenorhabditis elegans | Yes | species | eukaryota | invertebrates | species | 6239 | click here |
| calhevirus 1 | Yes | species | viruses and viroids | viruses | species | 870710 | click here |
| california encephalitis orthobunyavirus | Yes | species | | | species | 1933264 | click here |
| california encephalitis virus | Yes | no rank | viruses and viroids | viruses | no rank | 35305 | click here |
| campylobacter coli | Yes | species | bacteria | bacteria | species | 195 | click here |
| campylobacter corcagiensis | Yes | species | | | species | 1448857 | click here |
| campylobacter jejuni | Yes | species | bacteria | bacteria | species | 197 | click here |
| campylobacter jejuni subsp. jejuni | Yes | subspecies | bacteria | bacteria | subspecies | 32022 | click here |
| camula virus | Yes | species | | | species | 1960157 | click here |
| candida albicans | Yes | species | eukaryota | plants | species | 5476 | click here |
| candidatus mycoplasma haemomacaque | Yes | species | | | species | 1331996 | click here |
| canine coronavirus | Yes | no rank | viruses and viroids | viruses | no rank | 11153 | click here |
| canine distemper virus | Yes | species | viruses and viroids | viruses | species | 11232 | click here |
| capillaria hepatica | Yes | species | | | species | 1239592 | click here |
| cardiovirus a | Yes | species | | | species | 1821749 | click here |
| cedar virus | Yes | species | | | species | 1221391 | click here |
| cellulomonas hominis | Yes | species | bacteria | bacteria | species | 156981 | click here |
| cercocebus agilis cytomegalovirus 1 | Yes | species | viruses and viroids | viruses | species | 291823 | click here |
| cercocebus atys lymphocryptovirus 1 | Yes | species | viruses and viroids | viruses | species | 691496 | click here |
| cercocebus torquatus foamy virus | Yes | no rank | | | no rank | 1100835 | click here |
| cercopithecine herpesvirus 1 (strain e2490) | Yes | no rank | viruses and viroids | viruses | no rank | 260965 | click here |
| cercopithecine herpesvirus 2 | Yes | species | viruses and viroids | viruses | species | 10317 | click here |
| cercopithecine herpesvirus 3 | Yes | species | viruses and viroids | viruses | species | 172652 | click here |