"Neil Jones" wrote in message

Ricin is 6,000 times more poisonous per gram than cyanide. There is no
antidote but scientists are working on a vaccine.

Surely you can only vaccinate against viruses? Depending on how the ricin
was ingested I'd expect you'ld have to ingest another chemical by the same
method which would react with the ricin to produce a non-toxic compound?

Martin