World’s Worst Spider Bites

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Almost all spiders are venomous, but not all spider bites result in the injection of venom. Pain from non-venomous, so-called “dry bites” typically lasts for 5 to 60 minutes while pain from envenomating spider bites may last for longer than 24 hours.[8] Bleeding also may occur with a bite. Signs of a bacterial infection due to a spider bite occur infrequently (0.9%).

A study of 750 definite spider bites in Australia indicated that 6% of spider bites cause significant effects, the vast majority of these being redback spider bites causing significant pain lasting more than 24 hours.[9] Activation of the sympathetic nervous system can lead to sweating, high blood pressure and gooseflesh.[10]

Most recluse spider bites are minor with little or no necrosis. However, a small number of bites produce necrotic skin lesions. First pain and tenderness at the site begin. The redness changes over 2 to 3 days to a bluish sinking patch of dead skin—the hallmark of necrosis. The wound heals slowly over months but usually completely.[11] and, rarely, widespread symptoms, including profound anemia. Rarely the bite may also produce the systemic condition with occasional fatalities