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Lethality of ricin (based on [83]).
| Exposure | Inhalation | Intravenous Injection | Ingestion | Subcutaneous Injection |
|---|---|---|---|---|
| Human LD50 | 3 µg/kg | 3 µg/kg | 22–25 µg/kg | 500 µg/kg |
| Mice LD50 | 3–5 µg/kg | 5 µg/kg | 20 mg/kg | 24 µg/kg |
| Time to death | 36–72 hrs | 36–72 hrs | 6–8 days | 3–4 days |
