Snake bites occur when a snake bites the skin. They are medical emergencies if the snake is venomous.Venomous animals account for a large number of deaths and injuries worldwide. Snakes alone are estimated to inflict 2.5 million venomous bites each year, resulting in about 125,000 deaths. The actual number may be much larger. Southeast Asia, India, Brazil, and areas of Africa have the most deaths due to snakebite.