C
- Calymmatobacterium granulomatis
- Campylobacter
- Campylobacter coli
- Campylobacter fetus
- Campylobacter jejuni
- Campylobacter pylori
- Chlamydia
- Chlamydia trachomatis
- Chlamydophila
- Chlamydophila pneumoniae (previously called Chlamydia pneumoniae)
- Chlamydophila psittaci (previously called Chlamydia psittaci)
- Clostridium
- Clostridium botulinum
- Clostridium difficile
- Clostridium perfringens (previously called Clostridium welchii)
- Clostridium tetani
- Corynebacterium
- Corynebacterium diphtheriae
- Corynebacterium fusiforme
- Coxiella burnetii
Read more about this topic: List Of Clinically Important Bacteria