Tetrodotoxin (TTX) is an extremely toxic marine compound produced by different genera of bacteria that can reach humans through ingestion mainly of pufferfish but also of other contaminated fish species. marine gastropods or bivalves. TTX blocks voltage-gated sodium channels inhibiting neurotransmission. which in severe cases triggers cardiorespiratory failure. https://www.roneverhart.com/Happy-Camper-Dog-Shirt/