| Genus | Species Num | Strain Num | SOURCE |
|---|---|---|---|
| Adlercreutzia | 1 | 1 | MGYG |
| Aerococcus | 1 | 1 | HMP |
| Aeromicrobium | 2 | 2 | HMP/MGYG |
| Aeromonas | 6 | 8 | HMP/MGYG |
| Afipia | 3 | 3 | HMP/MGYG |
| Agathobaculum | 2 | 2 | MGYG |
| Aggregatibacter | 3 | 4 | HMP/MGYG |
| Agrobacterium | 1 | 1 | HMP |
| Akkermansia | 1 | 5 | HMP/MGYG |
| Alcanivorax | 2 | 2 | HMP |