THE MERCK MANUAL: The Merck Manual of Diagnosis and Therapymultimedia

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Lyme Disease

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Ixodes scapularis

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Ixodes scapularis

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  • Lyme Disease
  • This image demonstrates, clockwise from the lower left, the larval, nymphal, adult male, and unengorged adult female stages of the Ixodes scapularis tick. Most cases of Lyme disease are transmitted by nymph bites. A nymph is about the size of a poppy seed. Nymph bites occur most commonly between May and July.

    Image courtesy of Jim Occi and www.insectimages.org.

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