According to WHO, snake venom poisoning is registered annually in 500,000 people, among them 6-8% of cases are fatal. The most severe poisoning occurs when a snake bites the head and neck or when the venom gets directly into the blood. When bitten by asps and sea snakes, there is often no pain, but within 20-30 minutes the condition sharply worsens, weakness develops, a feeling of numbness in the face and body, and collapse due to the release of histamine.