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A number of spiders can cause spider bites that are medically important. Almost all spiders produce venom but only a few are able to cause significant harm to humans. [1] Two medically important spider genera have a worldwide distribution—Latrodectus and Loxosceles. Others have a limited distribution.
Differences between the venom of male and female Phoneutria nigriventer have been reported, with females producing a greater quantity of venom. [17] PhTx-2 is considered the most toxic group, which is also potent for primates. [18] Humans can be ten times more sensitive to the P. nigriventer venom compared to mice. Primates, such as monkeys and ...
The LD 50 in mice of the male spiders crude venom was found to be 11.3 mg/kg. The female spiders venom was found to be 80 mg/kg. The female spiders venom was found to be 80 mg/kg. The LD 50 value of pure delta atracotoxin which was isolated from a male spider was 0.16 mg/kg when tested on mice less than 2 days old.
But the venom from a brown recluse spider can cause serious skin problems around the area of the bite, which typically become increasingly painful in the hours after the bite. Black widow spider bites
The venom of a black widow spider, however, is a neurotoxin, the CDC says. Therefore, black widow venom causes widespread pain across an area of the body and symptoms that aren't limited to the ...
Most spider bites are managed with supportive care such as nonsteroidal anti-inflammatory drugs (including ibuprofen) for pain and antihistamines for itchiness. [6] Opioids may be used if the pain is severe. [6] While an antivenom exists for black widow spider venom, it is associated with anaphylaxis and therefore not commonly used in the ...
Bee stings differ from insect bites, with the venom of stinging insects having considerable chemical variation. The reaction of a person to a bee sting may vary according to the bee species. While bee stinger venom is slightly acidic and causes only mild pain in most people, [1] allergic reactions may occur in people with allergies to venom ...
Spider behavior may be caused by limited human interaction. Spider defense against predators include camouflage, and escape by falling or running. [23] Biting is a last resort and the amount of venom injected varies greatly. Spider venom toxicity can be evaluated in experimental animals, or reported from accidental bites.