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Black-legged, or deer ticks, can transmit Lyme disease to humans.

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Ticks latch onto skin where they feed on blood.

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Ticks can cause Lyme disease which may cause a bull's-eye rash.

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Female black widows have a bright-coloured "hourglass" on their underside.

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Tiny red fang marks identify black widow spider bites.

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Brown recluses have a "violin" pattern in the upper body, where legs attach

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A brown recluse spiders bite can cause tissue death.

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Head lice are grayish-white and no bigger than sesame seeds.

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Scalp with skin infection from scratching: lice eggs are glued to the hair.

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A close look at a flea.

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Flea bites result in raised, itchy spots with puncture marks in the center.

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Like a wasp, a yellow jacket can inflict multiple stings.

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A wasp sting, let, and a severe allergic reaction to a wasp sting, right

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A close look at a red fire ant.

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Painful bites from the fire ant quickly fill with pus.

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Chiggers, or harvest mites, usually cannot be seen without magnification.

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Itchy, red welts can result from chigger bites.

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Scabies are tiny mites that burrow into your skin

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Weeks may pass before itching and skin sores develop.

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Bedbugs are very tiny and can be seen by the astute observer.

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Bedbug bites do not usually require treatment

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The puss caterpillar is close to 1 inch long

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Evidence of contact with a puss caterpillar

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The Arizona bark scorpion's venom is very dangerous.

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Deerflies are larger than a housefly and have a pattern on the wing.

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Mosquitoes can carry diseases such as West Nile virus and dengue fever.

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Houseflies don't bite, but they can carry harmful bacteria.

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Dead cockroaches can trigger asthma and allergic reactions.


Source: Bad Bugs [MedicineNet.com]