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Thanks. Here are a few scary tidbits from the CDC:

It would take a deliberate act to make ricin and use it to poison people. Accidental exposure to ricin is highly unlikely.

People can breathe in ricin mist or powder and be poisoned.

Ricin can also get into water or food and then be swallowed.

Pellets of ricin, or ricin dissolved in a liquid, can be injected into people’s bodies.

Depending on the route of exposure (such as injection), as little as 500 micrograms of ricin could be enough to kill an adult. A 500-microgram dose of ricin would be about the size of the head of a pin. A much greater amount would be needed to kill people if the ricin were inhaled (breathed in) or swallowed.