Cobra & Krait – these secrete Neurotoxic venom and cause Paralysis.
Viper – these secrete Haemotoxic venom and cause Haemolysis and Haemorrhage.
Sea Snakes – secrete myotoxic venom and cause Muscular pain.
Approximately 2500 different species of snakes are known. Approximately 20 % of the total number of the snake species is poisonous.
Features of Poisonous & Non-Poisonous snakes
Head – Triangle – except Cobra
Fangs – Present
Pupils – Elliptical pupil
Anal Plate – Single row of plates
Bite Mark – Fang Mark
Non Poisonous Snakes
Head – Rounded
Fangs – Not present
Pupils – Rounded
Anal Plate – Double row of plates
Bite Mark – Row of small teeth.
Symptoms due to Snake bite
Cobra or Krait
Mild Local symptoms — burning, redness, swelling, superficial necrosis.
Marked Neurotoxic effects.
Earliest symptom – Ptosis – inability to keep Eyes open.
Giddiness, Lethargy, Muscle weakness.
Spreading Paralysis – causing difficulty in speaking and breathing, Salivation, Vomiting. Frothing around mouth.
Viper Haemotoxic venom is very painful
Severe Local symptoms — Intense Pain, Inflammation, Oozing of haemolytic blood.
Marked Vasculotoxic effects.
Bleeding from mucous membrane of the Mouth, Anus, Nose and haemorrhages under the skin.
Because of local damage to circulatory cells, hemotoxic venom spreads more slowly and has a slower action than the neurotoxins.
Vascular Collapse – Cold Skin, Rapid feeble Pulse, Dilated Pupils insensitive to light, Gradual loss of consciousness.
Sea Snakes No Local symptoms.
Severe Pain while moving Neck, Trunk and Limbs. A few hours later urine turns Brown to Black due to the presence of muscle protein Myoglobin.