If inhaled, ricin can cause death within 36 to 48 hours from failure of the respiratory and circulatory systems.

CNN: What is ricin?

If inhaled, injected or ingested, less than a pinpoint of ricin can kill a person in 36 to 48 hours by causing failure of the respiratory and circulatory systems.

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If inhaled, injected or ingested, less than a pinpoint of ricin can kill a person within 36 to 48 hours because of the failure of the respiratory and circulatory systems.

CNN: Threatening letters to Bloomberg test positive for ricin