The decline in incidence rates was significant in all groups studied except for those below 15 years of age. This may be due to the fact that this age group was not involved in the health education program, since they receive care through the school health services. This supports the feasibility of preventing bites by not walking about barefooted. Clinical presentation, antivenin treatment and prognosis of snakebites in Hail region . Hematological investigations for cases of snakebite in Hail region.
Neurotoxins cause respiratory paralysis.
Cytolitic venom causes tissue destruction by digestion and hemorrhage due to hemolysis and destruction of the endothelial lining of the blood vessels. The manifestations of cytolitic envenomation, e.g., rattlesnake venom, are local pain, redness, swelling and extravasation of blood. Perioral tingling, metallic taste, nausea and vomiting, hypotension and coagulopathy may also occur. Neurotoxic envenomation may cause ptosis, dysphagia, diplopia and respiratory arrest. Other bites are caused mainly by the less toxic snake Malpolon moilensis and other non-toxic snakes.