parazapper
Interesting about the fence, if it is pulsed DC voltage, it should be helpful. Most electric fences are not which may be why that one is special.
Also, of note: I posted a while back about people in Indonesia sitting / laying on the electric train rails there to help control parasites. There were actually several articles on the internet.
In Africa, they will often use a car battery or even the spark from a plug wire to neutralize scorpion stings and venomous snake bites. Not sure how well this works but in desperation, I would certainly try most anything that might even help a little bit.
Many toxins are polar in nature so in theory, the use of electricity could help to neutralize them.