( ( Lyme disease ) ( ( is ( ( an infection ) ( caused ( by ( ( a ( corkscrew-shaped bacterium ) ) ( known ( as ( ( a spirochete ) ( -LRB- ( ( Borrelia burgdorferi ) -RRB- ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Lyme) (NN disease)) (VP (VBZ is) (NP (NP (DT an) (NN infection)) (VP (VBN caused) (PP (IN by) (NP (NP (DT a) (JJ corkscrew-shaped) (NN bacterium)) (VP (VBN known) (PP (IN as) (NP (NP (DT a) (NN spirochete)) (PRN (-LRB- -LRB-) (NP (NNP Borrelia) (NNP burgdorferi)) (-RRB- -RRB-)))))))))) (. .)))
Lyme disease is an infection caused by a corkscrew-shaped bacterium known as a spirochete ( 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.