- A. butzleri
- A. cibarius
- A. cryaerophilus
- A. halophilus
- A. nitrofigilis
- A. skirrowii
- A. sulfidicus
- Abrus precatorius
- ACN
- Acrobacter
- ad personam
- ADI
- ADI - Acceptable Daily Intake
- AEC
- AEC - Acceptable Exposure Concentration
- AEL
- AEL - Acceptable Exposure Level
- Alaria alata
- Alternaria
- AMR
- anon.
- AOEL
- AOEL - Acceptable Operator Exposure Level
- Arcobacter
- ARfD
- ARfD - Acute Reference Dose
- art.
- Aspergillus
- aureus