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How many spiders have poisonous venom that affects humans?

April 26, 2017affects humans poisonous spiders venom

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How many spiders have poisonous venom that affects humans?

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While there are only a few spiders in India that are really dangerous to humans, there are significant numbers around the world. The black widow spider found throughout the United States and recluse spiders have very toxic venom that can be life threatening to humans. Some wolf spiders in South America, and some running spiders (family Chiracanthium) worldwide have venom that causes painful symptoms in humans. Pigeon spiders of West Africa give very painful bites.