Most snakes in the United States are not poisonous. However, there are four types of poisonous snakes: rattle-snakes (rattlers), coral snakes, water moccasins (cottonmouths), and copperheads.
This boy of 8 was bitten on his toe by a snake. His foot is swollen, bluish, and tender to touch. The bite is on the side of his big toe. The swelling in his foot increased and spread gradually up his calf.