- Bacteremia
- Bacterial Infections
- Bacterial Meningitis
- Bacteriuria
- Bites and Stings
- Blindness
- Blood Loss, Surgical
- Blood Transfusion
- Bone Diseases
- Bordetella pertussis
- Botulism
- Brain Diseases
- Brain Edema
- Bronchial Hyperreactivity
- Bronchiectasis
- Bronchiolitis
- Bronchiolitis, Viral
- Bronchitis
- Bronchoconstriction
- Brucellosis
- Burkholderia cepacia complex
- Burkholderia Infections
- Burns