| bifidobacterium longum subsp. infantis | subspecies | bacteria | bacteria | subspecies | 1682 |
| bifidobacterium longum subsp. infantis atcc 15697 = jcm 1222 = dsm 20088 | no rank | bacteria | bacteria | no rank | 391904 |
| bifidobacterium longum subsp. infantis ek3 | no rank | | | no rank | 1457183 |