List of medically significant spider bites 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.
Most spider bites cause mild, treatable symptoms. Bites from black widow and brown recluse spiders require medical care.. However, some spiders produce toxic venoms that can cause skin lesions, systemic illnesses, and neurotoxicity.
One of the more common bites is inflicted by the widow spiders (Latrodectus species). Harmless spider bites usually don't produce any other symptoms. Many skin sores look the same but have other causes, such as a bacterial infection.
Bites from some spiders, such as widow spiders and recluse spiders, might cause serious signs and symptoms. Spider bites (Figure 1) usually result from spiders being accidentally trapped against the skin or being handled. This publication describes the two medically important spider groups, the group that causes the most spider bites in the United States, and pet spiders.
A black widow spider is a small, shiny, black, button-shaped spider with a red hourglass mark on its belly, and prefers warm climates. Black widow spider bites release a toxin that can cause damage to the nervous system, so emergency medical treatment is needed. Few spiders in the United States can cause serious illness or death.
The bites of harmless spiders cause reactions similar to that of a bee sting (e.g., swelling, redness, and stinging or pain at the site). Dangerous spiders that live in the United States include the brown recluse spider (also known as the violin or fiddleback spider) and the black widow spider. The bites of the black widow.
Myth: Spiders carry germs on their fangs that can cause infection. Fact: There is still no solid evidence of any spider causing an infection in human tissues by its bite. However, since this section was first written, a study by C.L.B.
Monteiro and others of the Brazilian recluse spider, Loxosceles intermedia, found bacteria, including the gangrene-causing Clostridium perfringens, on the fangs. Serious injuries from spider bites can include severe wounds caused by the tissue-destroying venom of brown spiders and bodywide poisoning caused by the nerve-toxic venom of widow spiders. Wounds suspected of being caused by the brown spider are often caused by other problems, some potentially more serious.
Are You Confident of the Diagnosis? Spider bites can cause myriad symptoms, ranging from a mild discomfort or burning to life-threatening systemic organ failure, hemolytic anemia, and death. Most species of spiders are not known to bite humans, and only a small portion of those species that do bite humans are known to cause serious disease.