| Subject | English | Spanish |
| health., nat.res. | anthrax bacillus | bacilo del carbunco (Bacillus anthracis) |
| med. | bacilli carrier | portador de bacilos tíficos |
| health., anim.husb. | Bacillus anthracis infection | carbuncosis |
| health., anim.husb. | Bacillus anthracis infection | carbunco |
| obs., health., anim.husb. | Bacillus anthracis infection | ántrax |
| comp., MS | bacillus Calmette-Guérin vaccine | vacuna contra el bacilo de Calmette-Guérin (A serum against tuberculosis that is prepared from a strain of the weakened live bovine tuberculosis bacillus and used for vaccination against tuberculosis and also in cancer chemotherapy) |
| nat.sc., health., anim.husb. | Bacillus larvae infection | podredumbre maligna de la cría |
| nat.sc., health., anim.husb. | Bacillus larvae infection | peste maligna de la cría |
| med. | Bacillus subtilis genome | genoma de Bacillus subtilis |
| med. | Calmette-Guérin bacillus | bacilo de Calmette-Guerin |
| med. | Koch-Weeks bacillus | bacilo de Koch-Weeks (Haemophilus aegyptius) |
| med. | marginal bacillus | bacilo marginal |
| med. | Ogata bacillus | shigella disenteriae |
| med. | Ogata bacillus | bacillus disenteriae |
| bacteriol. | tubercle bacilli | bacilos de la tuberculosis |