Although these spores are commonly found in soil, honey is a more frequent source of spores causing infant botulism by lodging in the baby's intestinal tract and producing the neurotoxin.
Also, botulinum toxin is a neurotoxin that blocks the ability of motor nerves to release acetylcholine, the neurotransmitter that relays nerve signals to muscles.
Lindane (1% or higher) (Kwell), an organochloride neurotoxin, can induce seizures and death in susceptible people, even when used according to the directions.
Contamination from any of the sources results in growth of the bacteria in the infant's intestine and production of the neurotoxin.
Mercury is a known neurotoxin, a dangerous metal second only to uranium among the most harmful natural substances.
Instead, bacteria may reproduce inside the can or jar, releasing the deadly neurotoxin.