Lyme disease is caused by a bacterium known as a spirochete because of its long, corkscrew shape. The infectious organism is named Borrelia burgdorferi. The photomicrograph shows the typical corkscrew appearance of a spirochete. (Courtesy of the Centers for Disease Control.)

Acquired Date: 1/1/1997 12:00:00 AM Acquired From: Mosby Publishing Company

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