![]() The Centers for Disease Control and Prevention (CDC) list two types of spider in the U.S. Yet, some species produce venom that is powerful enough to harm a person. If a spider does bite, it will usually cause no more harm to a person than a moderate insect bite. Also, the fangs of many species cannot pierce human skin. However, the venom in nearly all spiders is too weak to have a significant effect on a human. In this sense, most spiders are venomous. Most spiders use venom to kill their prey. This could happen if a person puts their hand in a box where a spider is living or if they put on a jacket that has a spider hiding inside. Spiders will only bite in self-defense, for example, when they feel trapped or under threat. Spider bites can cause pain and swelling, but some symptoms or what a spider bite looks like will depend on the type of spider. Prevention and treatment of spider bites.Very few spider species in the United States can harm humans, but some spider bites can potentially be dangerous.
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