For botulinum, it's the toxin that causes botulism which can be viewed here: https://www.cdc.gov/botulism/symptoms.html https://www.cdc.gov/botulism/symptoms.ht

For botulinum, it's the toxin that causes botulism which can be viewed here: https://www.cdc.gov/botulism/symptoms.html https://www.cdc.gov/botulism/symptoms.html For saxitoxin, it's the toxin that's best known for causing paralytic shellfish poisoning. TL;DR: it attacks the bodies nerves and leads to muscle paralysis and can result in paralysis of the muscles needed to breath.