( ( ( Lyme disease ) ( is ( ( caused ( by ( a ( corkscrew-shaped bacterium ) ) ) ) ( , ( or ( spirochete , ) ) ) ) ) ) ( ( called ( Borrelia burgdorferi ) ) . ) )
(ROOT (SINV (S (NP (JJ Lyme) (NN disease)) (VP (VBZ is) (UCP (VP (VBN caused) (PP (IN by) (NP (DT a) (JJ corkscrew-shaped) (NN bacterium)))) (, ,) (CC or) (ADJP (JJ spirochete)) (, ,)))) (VP (VBD called)) (NP (NNP Borrelia) (NNP burgdorferi)) (. .)))
Lyme disease is caused by a corkscrew-shaped bacterium, or spirochete, called Borrelia burgdorferi .
(ROOT (S (NP (JJ Lyme) (NN disease)) (VP (VBZ is) (VP (VBN caused) (PP (IN by) (NP (NNS bacteria))))) (. .)))
Lyme disease is caused by bacteria.