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I think cottonmouts have pretty strong venom for their size. The vast number of people who get bitten do survive.

The copperhead is less potent and nearly everyone survives their venom. The Florida subspecies of the Eastern Diamondback is the largest snake in the country and they are very dangerous because of the amount of venom they can inject.

Hardly anyone gets bitten by a coral snake as they chew to get their venom in. If they do get it in you are probably in for a bad time. They have be far the most potent venom but do not have as much of it.