Coral snakes have a deadly venom but people rarely die from the bite for three reasons:
1. The snake is very reclusive and must be sought out by someone, they don't attack unprovoked.
2. The snake must chew on the victim to inject the venom. A person would have to hold the snake and let him chew on them. They don't just inject the venom with a strike like a rattle snake.
3. Since an antivenom was made available in 1967 no one in the U.S. has died of a coral snake bite.
If a person did get severely bitten and was not treated it could result in death but it would have to be very special circumstances.
animals.nationalgeographic.com