( ( Lyme disease ) ( ( is ( caused ( by ( ( ( a type ) ( of bacterium ) ) ( that ( is ( carried ( by ( deer ticks ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Lyme) (NN disease)) (VP (VBZ is) (VP (VBN caused) (PP (IN by) (NP (NP (DT a) (NN type)) (PP (IN of) (NP (NN bacterium))) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (VP (VBN carried) (PP (IN by) (NP (JJ deer) (NNS ticks))))))))))) (. .)))
Lyme disease is caused by a type of bacterium that is carried by deer ticks.
(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.