Weights of snake and severity: patients with snake weighted more than 500 grams have probability of severe evenomation or death 4, 51 times higher than whom with smaller snake (CI =1, 77 - 11, 46), P = 0, 001) Source of snake and severity: patients bitten by raised snakes have the probability of severe evenomation or death 4, 99 times higher than snakes in natura l environment (CI=1, 74 - 14, 32, P=0, 001) Mechanism of bite and severity: 14/15 (93, 3%) of the patients bitten through a layer of bag or clothes had only mild or no evenomation.