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Nicole L. Blithe, DVM Lyme disease is a tick-borne disease that affects humans, dogs, and other animals.  It is spread by the deer tick (Ixodes) and is caused by a bacteria, Borrelia burgdorferi.  Ticks bite the host and secrete a substance that cements it to the skin.  While the tick takes a blood meal, the bacteria move from the midgut of the tick to the salivary glands of the tick and into the host.  The